Short Blocks

# Maths Year 1/2 Autumn Addition & Subtraction (C)

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

## Using different strategies for addition(suggested as 4 days)

### Planning and Activities

Day 1 Teaching
Show on the coat hanger that ‘2 count on 7’ and ‘7 count on 2’ give the same answer, but putting the bigger number first is more efficient because that leaves less to count on. Show three numbers, look for pairs to 10 or 20 to make the addition more efficient.
Group Activities: T with Y1
Y1 -- Discuss and decide whether or not to change the order of the addition number sentence.
Y2 -- In pairs, children spot addition bonds to 10 and 20 and use these to help add three numbers.

Day 2 Teaching
Add 3 and 4 by counting on, recording the hops on a beaded line.
Further teaching with Y2
Find totals of pairs of prices, e.g. 49p and 22p, by adding the tens and then the ones.
Group Activities: T with Y2
Y2 -- Play a game involving adding pairs of 2-digit numbers.

Day 3 Teaching
Add 20, then 3 more on the 0-100 line, drawing jumps of 10 and a hop of 3. Repeat to add 24 and 33.
Further Teaching with Y1
Add 2, 3 and 4 to teen numbers, recording hops on the 0–20 line.
Group Activities: T with Y1
Y2 Use the in-depth problem-solving investigation ‘Dicey Addition’ from NRICH as today’s group activity.
Or, use these activities:
Y1 -- Add 2, 3 and 4 using a beaded line or counting bears.
Y2 -- Add 22, 23, 24, 32, 33 or 34 on a beaded line or a 1-100 grid.

Day 4 Teaching
Use ‘Spider’ to count on in tens on a 1-100 grid, ensuring that children realise they don’t need to count in ones; they just move down one row.
Further Teaching with Y2
Group Tctivities: T with Y2
Y1 -- Move a spider on a 1-100 grid to repeatedly add 10.
Y2 -- Investigation, repeatedly adding, then subtracting 9 on a 1-100 grid.

### You Will Need

• Coat hanger and 5 pegs in one colour, 5 in another
• ‘Mild and chilled’ and ‘Hot and Spicy’ additions (see resources)
• Feely bag and 20-bead strings
• ‘0–20 beaded lines’ (see resources)
• Number cards 0–20 (one pack for each pair)
• Cubes
• Eight items with prices, e.g. 4 yoghurts and 4 fruits
• ‘1-100 grid’ (see resources)
• Additional activity sheets (see resources)
• Large dice with faces labelled 2, 2, 3, 3, 4, 4
• 25 counting bears
• A ‘cave’ (cardboard box with a small entrance cut out)
• Dice with +22, +23, +24, +32, +33 and +34 on the faces
• Plastic spider and coloured pencils

### Short Mental Workouts

Day 1
Pairs to 10 and 20

Day 2
Count on 2

Day 3
Count on 3

Day 4
Count in 10s

### Worksheets

Day 1
Y1: Decide whether to swap order of addition sentences to simplify counting on.
Y2: Choose three numbers to add, including a pair to 10 or 20.

Day 2
Y2: Use counting in tens and ones to add a 2-digit number. Add pairs of 2-digit numbers, scoring points for certain answers.

Day 3
Y2: Add multiples of 10 to 2-digit numbers, then add related 2-digit numbers.

Day 4
Y1: Use spider counting to fill in missing numbers on strips from a 1-100 grid.
Y2: Add and subtract 9 on a 1-100 grid.

### Mastery: Reasoning and Problem-Solving

Y1

• Draw 5 faces on a bus. Let 2 or 3 people get on. How many on the bus now? Write the addition.
• What is 5 add 4?
• Use the line below to help you complete these sums. Point at the first number and count on:
5 + 3 = ☐
6 + 1 = ☐
4 + 4 = ☐
7 + 2 = ☐
__________________________
1 2 3 4 5 6 7 8 9 10
• What is 10 more than 17?

Y2

• Complete the patterns:
17, 26, __, 44, __, __.
85, 76, __, 54, __, __.
• Here are the prices for 5 pencils:
A) 34p, B) 29p, C) 45p, D) 52p, E) 19p
The total is 48p. 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
Y1: There is no investigative activity for Year 1 in this Unit.

Use dice to generate 2-digit numbers which, when added together, will make the nearest total to 100. Dicey Addition from nrich.maths.org.

### Extra Support

Y1: Under the Cup
Find 1 more / 1 less than numbers from 1 to 10.

Y2: Sum Patterns
Use pattern and number bonds to derive related additions.