# Maths Year 2 Autumn More Addition & Subtraction

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

## Add/subtract using facts and place value (suggested as 2 days)

### With Tutor, Parent or Carer

Coming soon ...

### Mastery

### Worksheets

### Resources

### Catch-up Learning

### Teacher Tips

## Use facts/patterns to add/subtract (suggested as 3 days)

### Planning and Activities

### With Tutor, Parent or Carer

Coming soon ...

### Mastery

### Worksheets

### Resources

### Catch-up Learning

### Teacher Tips

## Add/subtract multiples of 10 (suggested as 2 days)

### Planning and Activities

### With Tutor, Parent or Carer

Coming soon ...

### Mastery

**In-depth Investigation:** The Number Square! from nrich.maths.org.

### Worksheets

### Resources

### Catch-up Learning

**Spider's Workout**Adding and subtracting 10 using a 1-100 grid

### Teacher Tips

## Add/subtract 11, 12, 21, 22, etc (suggested as 3 days)

### Planning and Activities

**Day 1 Teaching**

Use the 1-100 grid to demonstrate how we can add 11, 12, 13, 21, 22 or 23 using Spider first and then adding the ones. Share plenty of examples, with children recording number sentences.**Group Activities**Use the ‘Count down to Zero’ in-depth problem-solving investigation below as today’s group activity.

Or, use these activities:

-- Create, describe and begin to explain patterns created by repeated addition of 11, 12, 13, 21, 22 and 23.

**Day 2 Teaching**

Children show 40 on bead strings. Add 12 by sliding 10 beads then 2 more. Record 40 + 12 = 52. Show how to record hops of 10 and 2 on a beaded line. Also show on a 1-100 grid. Which do children find easier? Repeat for adding 13, 21, 22, 23, 31, 32 and 33.

**Group Activities**

-- Play a game to practise adding 11, 12, 13, 21, 22, 23, 31, 32, and 33. Some children will reason about number choices.

**Day 3 Teaching**

Write 65 – 11. Ask children how to the find answer. Demonstrate jumping back on the beaded line and also moving up and across on the 1-100 grid. Repeat for other subtractions, e.g. 48 – 11 and 48 – 21.**Group Activities**

-- Using a 1-100 grid, children play a game in pairs where they rehearse adding or subtracting near multiples of 10, beginning to predict and reason about their answers.

### You Will Need

- 1-100 grids (see resources)
- Counters of different colours & coins
- 0-100 beaded lines
- Addition cards (see resources)
- Additional activity sheets (see resources)
- Coins, including lots of 10ps and 1ps
- 1-100 bead strings
- Biscuits

### Mental/Oral Maths Starters

**Day 1**

Add/ subtract 20 *(pre-requisite skills)*

**Suggested for Day 2**

2 more/less than 2-digit numbers *(simmering skills)*

**Suggested for Day 3 **Add 3 to 2-digit numbers

*(simmering skills)*

### Worksheets

**Day 1**

Most children create their own questions by selecting pairs of numbers to add. Some will complete a challenge involving missing numbers.

**Day 2**

Children are set different challenges to add 11, 12, 13, 21, 22, 23, 31, 32 or 33 to other 2-digit numbers; answers ≤110.

**Day 3**

Children calculate which of a set of given numbers is required to make a set of given calculations correct.

### Mastery: Reasoning and Problem-Solving

- Write the missing numbers in these calculations:

56 + ☐ = 86

86 + ☐ = 87

So, 56 + ☐ = 87

51 – ☐ = 31

31 – ☐ = 29

So, 51 – ☐ = 29 - Complete these diagrams:

Diagram 1:

? | ||

48 | 21 |

Diagram 2

63 | |

31 | ? |

- I think of a number, then add 11, then 22, then 33 to it. My answer is 70. What number did I start with?

**In-depth Investigation: Count Down to Zero**Children take turns to subtract 1, 2 or 3 from a 2-digit number greater than 20. They use strategies to help them win a game by reaching zero first.

### Extra Support

**Down the Stairs**

Adding 11 to 2-digit numbers

**Up the Stairs**Subtracting 11 from 2-digit numbers

## Add/subtract near multiples of 10 (suggested as 3 days)

### Planning and Activities

**Day 1 Teaching**Write 36 + 19. 19 is nearly..? 20! Ring 36 on a 1-100 grid. Count on to 2 steps of 10 to work out 36 + 20. But 19 isn’t a multiple of 10 - it is only nearly 20, so we have to take off 1. Add other near multiples of 10 by adding a multiple of 10 and adjusting.

**Group Activities**

-- Children practise adding ‘nearly numbers’ by adding a multiple of 10 and then adjusting to find the answer. Children use a 1-100 grid to support addition and/or investigate patterns.

**Day 2 Teaching**Display a 1-100 grid, with multiples of 10 coloured red. Identify numbers that are nearly multiples of 10 - ‘nearly numbers’ - 9, 19, 29 etc. 29 is nearly..? 30. Repeat for each ‘nearly number’. Use a calculator to add nearly numbers to 2-digit numbers. Notice patterns.

**Group Activities**

Use the ‘Nines to Zero’ in-depth problem-solving investigation below as today’s group activity.

Or, use these activities:

**-- Whole class investigation. In order to focus on mathematical reasoning, children use calculators. Describe and explain patterns by recording the calculations and answers that occur when adding ‘nearly numbers’.**

### You Will Need

- 1-100 grid with multiples of 10 squares coloured red (see resources)
- 1-100 grids (see resources)
- Nearly numbers board (see resources)
- Small square Post-it notes
- Calculators

### Mental/Oral Maths Starters

**Day 1**

Count in 10s *(pre-requisite skills)*

**Day 2**

Add 20 *(pre-requisite skills)*

### Worksheets

**Day 1**

Children rehearse adding ‘nearly numbers’ using the strategy of adding the multiple of 10 and then subtracting 1.

**Day 2**

Children use calculators to help them look for patterns when adding 9, 19, 29 and 39.

### Mastery: Reasoning and Problem-Solving

- Write 3 additions which include a 2-digit number and the number 22.
- Complete each number sentence:

27 + ☐ = 46

☐ + 29 = 73

☐ – 19 = 56 - Complete the patterns:

17, 26, __, 44, __, __.

5, 34, 63, __, __. - Start with 21. Add 9, then add 19, then add 29. What is the answer? Subtract 9, then subtract 19, then subtract 29.
- Start with 18 and do the same 6 calculations. Can you predict the answer before doing the last 3 calculations?

**In-depth investigation: Nines to Zero** Children repeatedly add 9 or 19 to numbers until they reach a multiple of 10. Look for patterns. Make and test predictions based on the patterns.

### Extra Support

**More Spider Counting**Counting back in 10s

## Add pairs of 2-digit numbers (suggested as 2 days)

### Planning and Activities

**Day 1 Teaching**

Show 4 items priced 45p, 38p, 49p, 33p, & 4 different items priced 21, 22p 23p and 24p. Use these to find totals of pairs of prices, e.g. 49p and 22p, by adding the 10s and then the 1s.**Group Activities**

-- Play games involving adding pairs of 2-digit numbers.

**Day 2 Teaching**

Ask children in 2s to make up 2 additions, 1 where they add a ‘nearly’ number and 1 where they add an ‘ordinary’ number. Share & ask children to help you work out answers either using a 1-100 grid or a 0-100 beaded line.**Group Activities**Use the in-depth problem-solving investigation ‘Five Steps to 50’ from NRICH as today’s group activity.

Or, use these activities:

-- Most children play Bingo to practise adding ‘ordinary’ and ‘nearly’ numbers, choosing and using appropriate strategies. Some may sort then solve calculations.

### You Will Need

- Four items priced 45p, 38p, 49p and 33p, & four priced 21, 22p 23p and 24p
- 1-100 grid (see resources)
- 0 to 100 beaded line to display on the board (see resources)
- Additional activity sheets (see resources)

### Mental/Oral Maths Starters

**Day 1**Add 3 to 2-digit numbers

*(pre-requisite skills)*

**Suggested for Day 2**Number facts

*(simmering skills)*

### Worksheets

**Day 1**

Most children use ‘Choose your own’ sheets to generate and solve different addition problems involving adding 2-digit numbers.

**Day 2**

Children practise adding ‘ordinary’ and ‘nearly’ numbers using a chosen method.

### Mastery: Reasoning and Problem-Solving

- Here are the prices for 5 pencils:

A 34p

B 29p

C 45p

D 52p

E 19p

The total is 53p. Which 2 pencils did you buy?

What is the most you can spend on 2 pencils?

What is the least you can spend on 2 pencils? - What’s the same, what’s different?

54 + 39 = 93, 59 + 34 = 93

39 + 54 = 93, 34 + 59 = 93

**In-depth investigation:** Five Steps to 50 (NRICH.maths.org)

Children navigate the number line by adding or subtracting 1, 10 or 100.

### Extra Support

**Sum Patterns**Using pattern and number bonds to work out related additions, e.g. 3 + 2 = 5, so 13 + 2 = 15, 23 + 2 = 25, 33 + 2 = 35