Short Blocks

# Maths Year 2 Autumn More Addition and Subtraction (A)

Each unit has everything you need to teach a set of related skills and concepts.

## Use facts to add several numbers(suggested as 2 days)

### Planning and Activities

Day 1 Teaching
Use a 20 bead frame to rehearse bonds to 10 and 20. Then use these facts to spot pairs to 10 and 20 when adding three numbers, e.g. 13 + 8 + 7 or 6 + 7 + 4. Encourage children to spot the bond to make the addition easy.
Group Activities
Use the in-depth problem-solving investigation ‘Getting the Balance’ from NRICH as today’s group activity. Or, use these activities:
-- Children work in pairs to use number facts in adding three or four numbers less than 20.
Day 2 Teaching
Write ■ + ▲ = 10 on f/chart. There are 2 mystery numbers here. What could they be? If square is 8, ask what triangle is? What if square was 1? So there are lots of possible answers. Repeat for different pairs of mystery numbers including subtraction: 20 - ■ - ▲ = 15.
Group Activities
-- Children learn how to find the mystery number in a number sentence using known number facts.

### You Will Need

• Bean bag
• 0-20 cards
• ‘Slidy box’ cards
• Activity sheet of mystery number sentences (see resources)

### Mental/Oral Maths Starters

Day 1
Pairs to 10 (pre-requisite skills)

Suggested for Day 2

### Worksheets

Day 1
Children complete a number search to find number bonds to 20.

Day 2
Children complete a number search to find 3 numbers that add up to 20.

### Mastery: Reasoning and Problem-Solving

• Complete these bar diagrams:
Diagram 1
 20 13

Diagram 2

 20 4
• Write a sentence with a missing number. It must also include the number 20.
• Correct Tina’s work. What mistake is she making?
13 + 17 = 20
20 – 14 = 16
20 – 11 = 19

In-depth Investigation: Getting the Balance
Can you hang weights in the right place to make the scale balance? Getting the Balance from nrich.maths.org.

### Extra Support

Give me 5...or 6 or 7
Finding pairs with a total of 5, 6 and 7