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

Objectives

Children's learning outcomes are emphasised
Assessment for learning
  • Solve one-step and two-step problems involving numbers, money or measures, including time, choosing and carrying out appropriate calculations

    I can solve a problem by writing down what calculation I should do

A box holds 35 nuts.
John eats 17 nuts. How many nuts are left?
How many people can have 5 nuts each?
How many nuts are there in 3 boxes?
What calculation did you do each time?
Anna has a 50p coin and three 20p coins. How much is this altogether?
Show how you worked out the answer. How did you decide what calculations to do?

  • Represent the information in a puzzle or problem using numbers, images or diagrams; use these to find a solution and present it in context, where appropriate using £ .p notation or units of measure

    I can draw a picture to help make sense of a problem

A spider has eight legs. How many legs do six spiders have?
How did you find the answer? What did you write down or draw?
Anna is 118 cm tall. Her brother is 97 cm tall. How much taller is Anna?
Draw a picture or use a number line to help you to find the answer.
Ali had 50 apples. He sold some and then had 20 left. Which of these is a number sentence that shows this?
Square Minus 20 = 50
B 20 Minus Square = 50
Square Minus 50 = 20
D 50 Minus Square = 20

  • Identify patterns and relationships involving numbers or shapes, and use these to solve problems

    I can find numbers or shapes that match a property

What is special about the shaded numbers in the grid? Suggest some other numbers that would be shaded.
Part of a 100 square, 61 to 90 with 5s and 10s shaded
Look at this set of 2-D shapes. Identify the shapes in the set that have one right angle, two right angles, more than two right angles.

  • Read and write proper fractions (e.g.three sevenths, nine tenths), interpreting the denominator as the parts of a whole and the numerator as the number of parts; identify and estimate fractions of shapes; use diagrams to compare fractions and establish equivalents

    I can say what fraction of a shape is shaded

What fraction of this shape is shaded? Can you say this fraction in another way?
10 squares, 5 shaded
Roughly how much of this cake has been eaten?
A cake missing a quarter

  • Derive and recall all addition and subtraction facts for each number to 20, sums and differences of multiples of 10 and number pairs that total 100

    I know and use all addition and subtraction facts to 20

    I can find what to add to a number to make 100

Tell me some addition and subtraction facts with the answer 12.
What is 12 Minus 7? What is 120 Minus 70? How did you find the answer?
Rick says 38 Plus 72 = 100. Is he right? What mistake has he made?

  • Derive and recall multiplication facts for the 2, 3, 4, 5, 6 and 10 times-tables and the corresponding division facts; recognise multiples of 2, 5 or 10 up to 1000

    I know the 2, 3, 4, 5, 6 and 10 times-tables and use them for division

    I recognise multiples of 2, 5 and 10

Two numbers multiply to make 20. What could they be?
If you cannot remember the 4 times-table, how could you work it out?
Find a number between 10 and 20 that gives a remainder when divided by 3.
Find a number that is a multiple of 2 but is not a multiple of 10.

  • Use knowledge of number operations and corresponding inverses, including doubling and halving, to estimate and check calculations

    I can estimate and check my calculations

Half of 38 is 19. Use the word "double"to make a sentence with the same numbers.
Find which two of these calculations are wrong:
A Half of 34 is 18
B 35 Minus 19 = 16
C 35 ÷ 5 = 12

  • Relate 2-D shapes and 3-D solids to drawings of them; describe, visualise, classify, draw and make the shapes

    I can describe the properties of shapes

    I can sort shapes using different properties

I dip a triangular prism in paint and make a print of each face. What shapes will I print?
Use cubes to make these shapes:Three sets of four cubes stacked in different ways

  • Use a set-square to draw right angles and to identify right angles in 2-D shapes; compare angles with a right angle; recognise that a straight line is equivalent to two right angles

    I can say whether the angles of a
    2-D shape are right angles or whether they are smaller or bigger

Find a quadrilateral that has two angles that are smaller than right angles and two that are bigger than right angles.
Which shapes always have four right angles?
Draw two lines to complete the square.
A grid of dots with two lines marked on it, forming half of a square

  • Develop and use specific vocabulary in different contexts

    I can picture a shape in my head when it is described to me

    I can describe a shape so that others can draw it

Imagine two squares the same size placed so that they touch side to side. What shape does this make?

Learning overview

Children continue to improve their knowledge of number facts , recalling them quickly and applying them accurately. They derive quickly pairs of numbers that total 100 and use them in calculations. For example, to find the difference between 115 and 89 they add 11 to 89 to reach 100, then add a further 15 to reach 115. They use mental, mental with jottings or written methods to support their understanding and communicate their thinking. They are able to explain their methods and reasoning and to evaluate which method is more efficient .

Children use a range of vocabulary associated with multiplication and division , including multiple and product . They use their knowledge of doubles to 20 to derive quickly, supported by jottings where necessary, doubles of multiples of 5 to 100 (e.g. 75×2), doubles of multiples of 50 to 500 (e.g. 450×2), and all corresponding halves. Children use their knowledge of multiplication facts and place value to multiply one-digit numbers by multiples of 10 to solve problems such as:

I stack 6 boxes on top of each other to make a tower. Each box is 30 cm tall. How tall is the tower?
Rani has 20 ml of medicine each day for one week. How much medicine does he have altogether?

Children understand the relationships between addition and subtraction, halving and doubling and multiplication and division; they check subtraction calculations with addition, halving with doubling, and division with multiplication. They also check with an equivalent calculation or alternative calculation strategy. For example, they check 35divided by2 with two 40s minus two 5s.
Children choose appropriately from the four operations to solve one- and two-step word problems involving numbers money and measures such as:

How many 20-minute cartoons can be saved on a 2-hour video tape?
I want to raise £ 5 for a sponsored walk. So far, three people have given me 70p each. How much more money do I need?

They choose suitable calculation strategies and use appropriate recording to support their understanding and record what they have done.
Children use their knowledge of number properties to solve mathematical problems or puzzles . They recognise simple patterns and relationships, for example to find a pair of numbers with a sum of 17 and a product of 70. They make and investigate general statements such as: A number ending in 1 cannot be in the 2, 4, 5 or 10 times-table . They explore patterns using the ITP "Number grid".

Screenshot of ITP 'Number grid' showing a checked grid with an array of numbers

Children use their understanding of division to recognise and find fractions of shapes . For example, they recognise that one fifth of a shape made from 10 squares will contain 2 squares because 10 ÷ 5 = 2. They recognise that one fifth of the shape is the same as "2 pieces out of 10" and that therefore one fifth is equivalent to two tenths. They solve problems such as finding all the possible ways of shading one third of a 6-square strip.

Children extend their knowledge of shape properties. They use appropriate mathematical vocabulary to describe the features of common 2-D and 3-D shapes including semicircles, hemispheres and prisms. They describe angles in 2-D shapes , identifying whether each angle is equal to, greater than or smaller than a right angle. They create and describe their own shapes; for example, they use a set-square to explore whether it is possible to draw a quadrilateral with exactly two right angles. They sort and classify collections of 2-D shapes in different ways using a range of properties including: "all sides are of equal length," "has at least one right angle" or "has at least one line of symmetry". They record their classifications on Venn and Carroll diagrams , including diagrams involving more than one criterion.

Children apply their knowledge of shape properties to solve mathematical problems or puzzles such as:
Can a triangle have two right angles?
How many different shapes can you make by placing two identical right-angled triangles edge to edge? How do you know you have found them all? Describe each shape.


Resource links to existing published material

Mathematical challenges for able pupils Key Stages 1 and 2

Activities

PDF 923KB

Activity 27 - Roly poly

Intervention programmes

Objectives for Springboard intervention unit

Springboard unit

Know by heart all addition and subtraction facts for 10 and 20
Understand that subtraction is the inverse of addition
Know that addition can be done in any order
Know all pairs of multiples of 10 with a total of 100

Springboard 3 Unit 2 sessions 1 and 2 (PDF 163KB)

Choose and use appropriate operations and calculation strategies to solve problems

Springboard 3 Unit 8 sessions 1 and 2 (PDF 154KB)

Supporting children with gaps in their mathematical understanding (Wave 3)

Diagnostic focus

Resource

Has difficulty in remembering number pairs totalling between ten and twenty, resulting in calculation errors

2 Y2plus/-
DfES 1123-2005 (PDF 75KB)

Has difficulty with identifying doubles and adding a small number to itself

2 YR×/÷
DfES 1138-2005 (PDF 74KB)

Does not use partitioning to find double twelve or double thirty-five

4b Y2×/÷
DfES 1146-2005 (PDF 68KB)

Does not use knowledge of doubles to find half of a number

5 Y2×/÷
DfES 1147-2005 (PDF 86KB)

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

Wave 3 addition and subtraction tracking children's learning charts

PDF 161KB 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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