Maths Year 1/2 Spring More Addition & Subtraction

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

Addition (suggested as 5 days)

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

  • 20-bead & 100-bead bar; Class set of 100-bead strings
  • ‘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.
    Write the answer.
    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, __, __.
  • 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?
  • 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?

In-depth Investigation: Domino additions
Y1 Children use dominoes to generate 2-digit number plus 1-digit number additions in a pattern.
Y2 Children use dominoes to generate pairs of numbers with a given total.

Extra Support

Y1: Mystery Sums
Finding how many more are needed to make 10.

Y2: Square Sums
Adding ‘friendly’ 2-digit numbers using partitioning (1s less than 10 and 10s less than 100)