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Year 5 Block B - Securing number facts, understanding shape Unit 3

Objectives

Children's learning outcomes are emphasised
Assessment for learning
  • Explore patterns, properties and relationships and propose a general statement involving numbers or shapes; identify examples for which the statement is true or false

    I can suggest a general statement and test whether it is true by investigating examples

Two square tiles are placed side by side. How many tiles are needed to surround them completely?

2 square tiles, then a 3 by 4 grid with 2 tiles in the middle shaded.

What if three square tiles were laid side by side? Four tiles? Five tiles? How many tiles would be needed if 100 tiles were laid side by side? Explain your answer.
'A number that ends in the digits 52 is always divisible by 4.' Give me an example where the statement is true. Can you find an example where the statement is false? Why not?

  • Represent a puzzle or problem by identifying and recording the information or calculations needed to solve it; find possible solutions and confirm them in the context of the problem

    I can split a word problem into steps and work out what calculation to do for each step. I can explain what the answer to each step tells me I recognise when there may be more than one solution to a problem and try to find them all

You need six drinking straws each the same length. Cut two of them in half. You now have eight straws, four long and four short. You can make two squares from the eight straws like this.

2 squares, 1 double in size

Arrange your eight straws to make three squares, all the same size. Draw a diagram to show your solution.

  • Use knowledge of place value and addition and subtraction of two-digit numbers to derive sums and differences and doubles and halves of decimals (e.g. 6.5 ± 2.7, half of 5.6, double 0.34)

    I can add/subtract decimals in my head by using a related two-digit addition or subtraction I can find the double or half of a decimal by doubling or halving the related whole number

Which of these subtractions can you do without any jottings? How did you find the difference between these two numbers? Talk me through your method.
Find half of 92. Use your answer to find half of 0.92. Explain the relationship between the two calculations.
What number added to 0.72 gives 1? How do you know?
What number lies exactly halfway between 0.48 and 0.74? How did you work this out?
I think of a number, halve it, then add 0.6. I get the answer 5.2. What number did I start with? How did you work out your answer?

  • Recall quickly multiplication facts up to 10 × 10 and use them to multiply pairs of multiples of 10 and 100; derive quickly corresponding division facts

    I can use tables facts to multiply multiples of 10 and 100 and to find linked division facts
What tips would you give someone who had forgotten the 7 times-table to help them to work it out?
What other links between times-tables are useful?
Find two numbers with a product of 1500. What other pairs can you find?
Find different ways of completing this calculation: 240 ÷ square = square
  • Use knowledge of rounding, place value, number facts and inverse operations to estimate and check calculations

    Before I solve a word problem, I work out an estimate for the answer

417 895 men and 176 243 women attended a football match. Roughly, how many people attended altogether?
Suggest a multiplication problem that will have an answer close to 2000.

  • Use efficient written methods to add and subtract whole numbers and decimals with up to two places

    I can explain each step when I write addition and subtraction calculations in columns

How did you find the difference between these two numbers? Talk me through your method.
Make up an example of an addition/subtraction involving decimals that you would do in your head and one you would do on paper. Explain why.
What could the two missing digits be? square 62 plus square 95 = 757

  • Use a calculator to solve problems, including those involving decimals or fractions (e.g. to find three quarters of 150g); interpret the display correctly in the context of measurement

    I can use a calculator to find missing numbers in calculations. I use inverse operations and number facts to help me

You have been using your calculator to find an answer. The answer in the display reads 5.6. What might this mean?
You save £ 1.35 per week. How many weeks is it before you can buy a book costing £ 18.49? Explain how you used your calculator to work out the answer.

  • Identify, visualise and describe properties of rectangles, triangles, regular polygons and 3-D solids; use knowledge of properties to draw 2-D shapes and identify and draw nets of 3-D shapes

    I use mathematical vocabulary to describe the features of a 2-D shape. I always say whether any angles in the shape are equal I use the properties of 3-D shapes to draw their nets accurately
Tell me some facts about rectangles.
Give me some instructions to get me to draw a rectangle.
What is the same about a square and a rectangle? What might be different?
Is it possible for a quadrilateral to have exactly three right angles? Why not?
Imagine you have a paper square and a pair of scissors. Imagine cutting off a corner of the square in one straight cut. Without saying anything, quickly draw the shape you cut off. Now draw the shape you have left. Compare your two shapes with the rest of your group. What are the names of your two shapes?
Describe how you would draw a net for a tetrahedron.
  • Identify different question types and evaluate impact on audience

    I know that when my teacher asks certain mathematical questions there may be more than one answer. I try to think of all the possible answers
What is the difference between these two questions?

What is the product of 12 and 7?
Tell me all the factor pairs of 84.

  • Understand the process of decision making

    I can explain why I decided to use a particular method to solve a problem. I can describe what was special about the problem that prompted my decisions
Why did you decide to use a mental/written/calculator method for this calculation? Why did you decide to change all the units to metres rather than centimetres? Why did you decide to use the scales rather than the balance?

Learning overview

Children investigate patterns and relationships between numbers. They continue sequences involving diagrams and numbers such as:

4 shapes starting with a octagon and adding four more each time forming crosses of increasing size

They look for and describe relationships between the numbers in the sequence. They use this to predict the next two terms and the 10th term. They explain the rule of the sequence and relate this to the diagrams, explaining why, for example, the terms increase by 4 each time.
Children use the vocabulary factor, multiple and product. They identify all the factors of a given number; for example, the factors of 20 are 1, 2, 4, 5, 10 and 20. They answer questions such as:

Find some numbers that have a factor of 4 and a factor of 5. What do you notice?
My age is a multiple of 8. Next year my age will be a multiple of 7. How old am I?

Children investigate the statement: Every whole number has an even number of factors. They discover that square numbers have an odd number of factors. Because they have found a counter-example they know that the statement cannot be true.
Children recognise multiples of 2, 5, 10 or 100. They test the statement: Any number that ends in the digits 52 is divisible by 4. They test some three-digit numbers then use their calculators to identify examples of larger numbers with the same property.
Children use their calculation skills and understanding of place value to solve problems such as:

0.italic square × italic square = 2. Find all possible ways to complete the calculation by placing one digit in each box.
Find two numbers with a difference of 1.95.
I double a number then add 1.52. The answer is 1.88. What number did I start with?
What number lies exactly halfway between 0.79 and 1.43?
Find all the different totals you can using two numbers from the set of numbers: 3.75, 13.75, 1.82, 0.76, 3.93.


They choose how to record their working, using mental methods with jottings or written methods as appropriate. They appreciate that where they are asked to find all possible answers they need to work methodically. They check answers using alternative calculations or the inverse operation.
Children round the numbers involved in calculations in order to find an approximate answer. They use this to check that the answer is sensible when solving word problems such as:

I buy six first-class stamps at 37p each. How much change will I get from £5?
There are approximately 1.75 pints in 1 litre. How many pint bottles can I fill using 8 litres of milk?

They use estimation, inverse operations and properties of numbers to help them to use a calculator efficiently to solve problems such as:

square square square 6 square = 6272
(square ÷ 5) - 23 = 30

Children continue to investigate properties of 3-D and 2-D shapes. They measure angles in regular shapes and establish that all of the angles in a regular shape are the same. They measure the angles in assorted equilateral triangles to establish that they are always 60degrees. They discover that the opposite angles of a parallelogram are always equal. Children use their knowledge of properties of shapes. For example, they investigate the number of different shapes that can be made by placing four identical equilateral triangles edge to edge, or four identical cubes face to face. They draw accurate nets for a range of 3-D shapes, including the nets of prisms.

Resource links to existing published material

Mathematical challenges for able pupils in Key Stages 1 and 2
Activities PDF 1MB
Activity 53 - Square it up
Activity 54 - Joins
Activity 55 - Money bags 
Activity 56 - A perfect match
Activity 57 - Presents
Activity 58 - Spot the shapes 2
Activity 59 - Four by four
Activity 61 - Make five numbers
Activity 63 - Jack's book
Activity 65 - Age old problems
Activity 66 - Zids and Zods
Intervention programmes
Objectives for Springboard intervention unit Springboard unit

Identify doubles and also near doubles using doubles already known
Halve numbers where the double is known
Understand and use £.p notation

Springboard 5 Unit 1 (PDF 305KB)
Springboard 5 Unit 1 supplementary (PDF 77KB)

Know by heart: all +/- facts for each number up to 20, all pairs of multiples of 100 with a  total of 1000, all pairs of multiples of 5 with a total of 100, all pairs of numbers with a total of 100
Extend understanding that subtraction is the inverse of addition

Springboard 5 Unit 3 (PDF 305KB)
Springboard 5 Unit 3 supplementary (PDF 85KB)
Develop and refine written methods for subtraction, building on mental methods. 
Reinforce the fact that subtraction is the inverse of addition
Springboard 5 Unit 8 (PDF 245KB)
Springboard 5 Unit 8a Part 1 supplementary (PDF 77KB)
Springboard 5 Unit 8a Part 2 supplementary (PDF 75KB)

Know the three- and four-times tables
Begin to know the six-times tables

Springboard 5 Unit 9 (PDF 269KB)
Springboard 5 Unit 9 supplementary (PDF 110KB)
Supporting children with gaps in their mathematical understanding (Wave 3)
Diagnostic focus Resource
Has an insecure understanding of the number system resulting in addition and subtraction errors and difficulty estimating 1 Y4 plus/-
DfES 1128-2005 (PDF 101KB)
Has difficulty in partitioning 2 Y4 plus/-
DfES 1129-2005 (PDF 78KB)
Does not make sensible decisions about when to use calculations laid out in columns 3 Y4 plus/-
DfES 1130-2005 (PDF 101KB)
Has difficulty adding three numbers in a column 4 Y4 plus/-
DfES 1131-2005 (PDF 95KB)
Does not use knowledge of doubles to finding half of a number 5 Y2 ×/÷
DfES 1147-2005 (PDF 86B)
Is not confident when recalling multiplication facts 1 Y4 ×/÷
DfES 1150-2005 (PDF 104KB)

Click here for information on different file formats and their usage.

Wave 3 addition and subtraction tracking children's learning charts

RTF 930KB Word 315KB

Wave 3 multiplication and division tracking children's learning charts

PDF 195KB RTF 1.3MB Word 430KB

Wave 3 Resource sheets and index of games booklet

PDF 500KB
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