Short Blocks

Maths Year 1/2 Spring Addition & Subtraction (B)

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

Planning and Activities

Day 1
Sort additions into 2 groups: those we prefer to calculate by counting on, and those where children would choose place value/number facts.
Further Teaching with Y1
Use the bead bar to show bridging 10 when adding 1-digit numbers.
Group Activities: T with Y1
Y1 -- Add two 1-digit numbers by bridging 10, using either a bead string or beaded line.
Y2 -- Sort and solve additions according to how they might best be solved (counting on, place value or number facts).

Day 2
Add 1--digit numbers of pennies, bridging 10p on a money line.
Further Teaching with Y2
Add 9 to 2-digit numbers by adding 10 then subtracting 1 on a 1 to 100 grid.
Group Activities: T with Y2
Y1 -- Use penny lines to help solve money additions, adding 1–6p or 1–10p.
Y2 -- Repeatedly add 9 on a 1 to 100 grid, starting at 19, and describe the pattern. Some children will work in pairs to add 10, then 9 to 2-digit numbers.

Day 3
Imagine the colours of beads when bridging 10 to find 8 + 3, for example. Discuss which additions bridge 10 and which don’t.
Further Teaching with Y2
Use place value cards then 10p and 1p coins to add pairs of 2-digit numbers (1s less than 10).
Group Activities: T with Y2
Y1 -- Use bead strings to add 5 and 6 to 6, 7, 8 and 9, discussing how the 5 and 6 are split each time. Record bridging 10 on a landmarked line.
Y2 -- Use 10p and 1p coins, or place value cards, to add 2-digit numbers.

Day 4
Use place value cards to add pairs of 2-digit numbers (1s greater than 10). Y1s use bridging to add the 1s.
Further Teaching with Y1
Use 1-digit + 1-digit facts to find 2-digit + 1-digit answers, such as using the answer to 4 + 3 to calculate 14 + 3, 24 + 3.
Group Activities: T with Y1
Use the in-depth problem-solving investigation ‘Domino additions’ as today’s group activity.
Or, use these activities:
Y1 – Refer to addition cards, or recall 1-digit + 1-digit addition facts; use these to find the answers to 2-digit + 1-digit calculations.
Y2 -- Use place value cards to add two 2-digit numbers, discuss if the 1s will make an extra 10 or not. Some children will sort additions into those with answers less/more than 80, because the 1s digits total more than 10.

Day 5
Calculate 5 + 4, 15 + 4, 25 + 4 … 95 + 4 on the 1–100 grid, discussing the pattern.
Further Teaching with Y2
Add 19 on a 1–100 grid by adding 20, then subtracting 1.
Group Activities:
Y1 -- Use dominoes to generate 2-digit plus 1-digit number additions in a pattern. Some children may answer addition number sentences, recognising and using known facts.
Y2 -- Add 19 on the 1–100 grid, by adding 20, then subtracting 1. Some children may add ‘nearly’ numbers using a calculator, look for patterns, predict answers

You Will Need

• ‘0–20 beaded line’ (see resources)
• ‘Sheet of 0–20 beaded lines’ (see resources)
• Plastic Fly; Two hoops
• ‘1–100 grid’ (see resources or use your own large grid)
• ‘Using number facts and place value for addition’ sheet (see resources)
• ‘0–100 beaded lines’ (see resources)
• ‘Number cards’ (see resources)
• ‘0–20p money lines’ (see resources)
• Real 1p and 10p coins
• 1–6 dice; 1–10 dice
• ‘1–100 grids’ (see resources)
• 10s and 1s place value cards
• Interactive whiteboard 10p and 1p coins
• ‘0–20 landmarked line’ (see resources)
• ‘Addition cards’ sheets 1–4 (see resources)
• 10–50 tens cards, 1–9 ones cards
• 1–100 grid with multiples of 10 coloured red (see resources)
• ‘Dominoes’ (actual or cut-out, see resources)
• Calculators

Short Mental Workouts

Day 1
Pairs to 10

Day 2
Counting on and back in 10s

Day 3
More pairs to 10

Day 4
Fact families

Day 5
Doubles

Worksheets

Day 1
Y1: Use a beaded line to bridge 10.
Y2: Code a series of additions according to how they might best be solved (counting on, place value or number facts).

Day 2
Y1: Add two items using a penny line, bridging 10.
Y2: Add 10, then 9 to 2-digit numbers.

Day 3
Y1: Identify sums greater than 10, calculate using a beaded line.
Y2: Add 2-digit numbers (1s less than 10).

Day 4
Y1: Calculate additions using patterns and known number facts.
Y2: Add 2-digit numbers (1s greater than 10).

Day 5
Y1: Use facts to solve addition number sentences.
Y2: Add ‘nearly numbers’ by adding the multiple of 10 and then subtracting 1.
Use calculators to help look for patterns when adding 9, 19, 29 and 39.

Mastery: Reasoning and Problem-Solving

Y1

• Write the number fact we use to solve:
34 + 5 = __, 64 + 5 = __
Write another sum that uses this fact.
• Write three other number sentences I know if I am told that 5 + 6 = 11.
• Choose two cards.
[6] [5] [3] [4] [5] [4]
Choose an efficient strategy to add them.
Tell me what strategy you used.
Choose three more and do it again.

Y2

• Complete each number sentence:
27 + ☐ = 46
☐ + 29 = 73
☐ – 19 = 56
• Complete the patterns:
17, 26, __,
44, __, __.
5, 34, 63, __, __.
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?
• 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?