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Year 2 Block B - Securing number facts, understanding shape Unit 1

Learning overview

In this learning overview are suggested assessment opportunities linked to the Assessment focuses within the Assessing Pupils’ Progress guidelines. As you plan your teaching for this Unit, draw on these suggestions and alternative methods to help you to gather evidence of attainment or to identify barriers to progress that will inform your planning to meet the needs of particular groups of pupils. When you make a periodic assessment of pupils’ learning, this accumulating evidence will help you to determine the level at which the pupils are working.

To gather evidence against the three Ma1 Assessment focuses (problem solving, reasoning and communicating) it is important that children are given space and time to develop their own approaches and strategies throughout the mathematics curriculum as well as through the application of skills across the curriculum.

In this Unit the illustrated Assessment focuses are:

  • Ma1, Reasoning
  • Ma2, Mental methods
  • Ma3, Properties of shape

Children know addition and subtraction facts for each number up to 10 and are learning which pairs of numbers make 20. They consolidate and use these number facts to add or subtract quickly, for example using the fact that 7 – 3 = 4 to find 57 – 3. They understand that addition and subtraction are inverses, and apply this knowledge in a number of ways. For example, they recognise that if you add 5 to a number and then subtract 5 you end up where you started; they state the addition fact linked to any subtraction fact and vice versa; they use addition to check the answer to subtraction calculations and subtraction to check addition.

Assessment focus: Ma2, Mental methods

Look for children recalling pairs of numbers that add to 10. Notice children who use this to give pairs of multiples of 10 that add to 100. Look for children who, given a multiple of ten, begin to use the addition facts they know to say how many more to make 100.

Children know that addition can be done in any order. They begin to use efficient methods for addition and subtraction; for example, to work out 5 + 47 they start at 47 and count on 5. They count from zero in steps of 2, 5 or 10, describing patterns in the count. They identify even and odd numbers. They identify multiples of 5 and 10, appreciating that multiples of 5 end in 0 or 5 and multiples of 10 end in 0.

Children recall doubles of all numbers to 10. They recognise that if you double a number then halve the answer you get back to where you started, and use this to find halves of numbers to 20.

Children use the appropriate operation to model and solve a word problem, such as:

A mango costs 48p. A pineapple costs 36p more than a mango. How much is a pineapple?

For example, they use practical equipment, a 100-square or empty number line to help them to make decisions. They record calculations using the plus (+), minus (–) and equals (=) signs. They explain their answers and describe their methods, for example using an empty number line.

2 empty number lines showing adding 48 to 36 by counting on 30, 2 and 4 or 2 and 34

Children use patterns, relationships and properties to solve number puzzles, such as:

How many dominoes have a total number of spots that is odd?
On a 100-square, what is the biggest number with a digit sum of 9?

Assessment focus: Ma1, Reasoning

Look for evidence of children recognising and using patterns to solve problems. For example, given the support of group discussion with an adult to help understand the problem and how to make a start, look for children who use the pattern of numbers on dominoes in a ‘double three set’ to work out which of the 10 dominoes is missing.

Children explore properties of shapes. For example, they sort a set of 3-D solids according to whether or not each solid possesses a given property, such as whether or not it has a rectangular face. They use their knowledge of shape names and properties, for example to predict which 3-D shapes will roll and which will slide when placed on a slope. They recognise and name shapes in different positions and orientations, including in pictures.

Children extend their understanding of properties of a range of 2-D shapes including pentagons, hexagons and octagons, both regular and irregular. They use mathematical vocabulary to name, classify and describe some features of shapes, such as the number of sides and whether the shape has a right angle. They draw and make shapes, for example using pinboards to make shapes with five straight sides (pentagons) and then identifying those with a right angle.

Assessment focus: Ma3, Properties of shapes

Look for children who choose to sort 2-D shapes using the number of sides or edges and corners. Look for children who know the names of familiar 2-D and 3-D shapes, for example square, rectangle, triangle, circle, cube and pyramid and begin to identify and name others such as hexagon, pentagon, octagon, sphere and cuboid. Look for children who match 2-D and 3-D shapes to pictures of them in different orientations.

Objectives

Children's learning outcomes are emphasised
Assessment for learning
  • Describe patterns and relationships involving numbers or shapes, make predictions and test these with examples

    I can sort a set of 3-D shapes
    I can continue a number pattern
    I can explain how I know

Show me the shapes that have: at least one rectangular face, one curved face, eight corners, ...
We have worked out that 3 + 5 = 8 and 13 + 5 = 18. Without calculating, tell me what 23 + 5 will be. What about 63 + 5?
Write the missing digits to make this correct.

2 digit by two digit addition sum with 2 digits missing

  • Solve problems involving addition, subtraction, multiplication or division in contexts of numbers, measures or pounds and pence

    I can solve a problem involving money

What do you look for when deciding the best order for adding numbers?
Mina and Ben play a game. Mina scores 70 points. Ben scores 42 points. How many more points does Mina score than Ben? Show me on the 100-square how to work out the answer. Now show me on an empty number line.
Anna has 54p. She buys as many pencils as she can.

2 digit by two digit addition sum with 2 digits missing

How much money will she have left? Use the coins to show me how to work out the answer.
  • Derive and recall all addition and subtraction facts for each number to at least 10, all pairs with totals to 20 and all pairs of multiples of 10 with totals up to 100

    I can recall number facts for each number up to 10

Look at this number sentence: square + diamond = 7. What could the two missing numbers be? What else?
Tell me all the pairs of numbers that make 7. How do you know you have told me them all?

  • Derive and recall multiplication facts for the 2, 5 and 10 times-tables and the related division facts; recognise multiples of 2, 5 and 10

    I can count in steps of 2, 5 or 10

What is the multiple of 10 before 70?
What three numbers come next: 35, 40, 45, ...?
What is the next even number after 24?

  • Understand that halving is the inverse of doubling and derive and recall doubles of all numbers to 20, and the corresponding halves

    I know that if I double a number then halve the answer I get back to the number I started with

I think of a number and double it. The answer is 18. What number was I thinking of? Explain how you know.

  • Use knowledge of number facts and operations to estimate and check answers to calculations

    I can check the answer to an addition by doing a related subtraction

You know that 7 + 8 = 15. Write down three other number sentences using these numbers.
What is the answer to 37 + 8? How can I check?
Only one of these sums is correct. Which one is it? Explain how you know.
25 + 7 = 30
18 + 5 = 28
10 + 10 = 19
19 + 6 = 25
12 + 4 = 14

  • Visualise common 2-D shapes and 3-D solids; identify shapes from pictures of them in different positions and orientations; sort, make and describe shapes, referring to their properties

    I can look at pictures of 2-D shapes and name them

How do you know that this shape is a square? What is special about it?
Two of these shapes are not hexagons. Which are they?
4 polygons

Here are five identical triangles.

Use some or all of the triangles to make a bigger triangle.

5 triangles

Is there another way to do it?

  • Listen to others in class, ask relevant questions and follow instructions

    I can listen to others when they speak to the class and ask a question about what they have said

Listen to Robert as he talks about the shape that he has made.
I am holding a shape behind my back. Try to find out what it is. Ask me questions about it, but I will only answer 'yes' or 'no'.


Resource links to existing published material

Mathematical challenges for able pupils Key Stages 1 and 2

Activities

PDF 645KB

Activity 9 - Sum up

Activity 17 - Cross-road

Intervention programmes

Springboard unit

None currently available

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

Diagnostic focus

Resource

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

5 Y2 ×/÷
DfES 1147-2005 (PDF 86KB)

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

2 Y2  plus/-
DfES 1123-2005 (PDF 75KB)

Is insecure is making links between addition and subtraction and/or recognising inverses

5 Y2  plus/-
DfES 1126-2005 (PDF 71KB)

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

Year 2 Securing number facts, understanding shape - Unit 1

PDF 52KB RTF 402KB Word 67KB

Wave 3 addition and subtraction tracking children's learning charts

PDF 164KB 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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