Short Blocks

Maths Year 1/2 Summer Addition and Subtraction

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

Addition (suggested as 2 days)

Planning and Activities

Day 1
Add 10, then 20, to 2-digt numbers, using Spider on a 1–100 grid. Begin with multiples of 10, then any 2-digit number. Record number sentences. Extend to adding 30.
Further Teaching with Y2
Use place value cards to model addition of pairs of 2-digit numbers by partitioning, e.g. 34 + 23, 45 + 24 (1s total less than 10),
then 46 + 25 (1s total greater than 10).
Group Activities: T with Y2
Y1 -- Choose 2-digit numbers and roll a dice to add 10, 20, or 30.
-- Pick a number on the grid and roll a dice to add up to 6 tens.
Y2 -- Play a card game to practise adding two 2-digit numbers.

Day 2
Add 10s and multiples of 10 on 1–100 grid.
Further Teaching with Y2
Children choose when to add 2-digit numbers by partitioning and recombining or by counting on in 10s and 1s. Discuss several examples and consider choices made.
Group Activities: T with Y2
Use the in-depth problem-solving investigation ‘Dicey Addition’ from NRICH as today’s group activity.
Or, use these activities:
Y1 -- Add a multiple of 10 to add to a number; record in a number sentence.
-- Calculate the missing number in an addition number sentence.
Y2 -- ‘Work backwards’ to suggest pairs of 2-digit numbers that add to make a given total.

You Will Need

  • Large 1–100 grid
  • Bean bag
  • 1–100 grids (see resources)
  • Plastic Spider
  • Mini-whiteboards and pens
  • 10s and 1s place value cards
  • ITP Place Value
  • Dice (stickered with two each of the numbers 10, 20 and 30)
  • Counters
  • 1–6 dice, 1-4 dice
  • 10–50 tens cards
  • 1–9 ones cards
  • Place value cards
  • ‘Numbers’ (see resources)
  • ‘Number cards’ (see resources)
  • ‘Spider counters’ (see resources, cut up into individual counters)
  • Flipchart and pens
  • 2-digit number cards

Short Mental Workouts

Day 1
Count on and back in 10s

Day 2
Count on and back in 10s from 1-digit numbers

Worksheets

Day 1
Y1: Add 10, 20, 30 or 40 to 1- or 2-digit numbers.
Y2: Add 2-digit numbers using partitioning: totals <90.
Add 2-digit numbers using partitioning: totals <100.

Day 2
Y1: Add 10p to 2-digit prices. Add 40p to 2-digit prices.
Y2: Add pairs of 2-digit numbers by partitioning or counting on.

Mastery: Reasoning and Problem-Solving

Y1

  • Complete each sentence:
    54 + 10 = ☐
    47 = 37 + ☐
    42 + 10 = ☐
  • Write the number 20 more than:
    35
    95
    66
    21
  • Complete each sentence:
    44 + 30 = ☐
    37 + ☐ = 57
    93 = ☐ + 30

Y2

  • Look at the bar diagram (see download). Calculate the value of the missing number.
  • Explain why it might help to change the order of this addition before you try to find the answer:
    15 + 62 = ☐
  • Would you use counting on or partitioning to calculate these additions? Why? Find the answers.
    35 + 57 77 + 22 84 + 6

In-depth Investigation: Dicey Addition
Play a game of addition and strategy to reach a given total. Dicey Addition (Game 1) from nrich.maths.org. Vary the target number to make it easier or more difficult, e.g.
Y1 Closest to 100 wins
Y2 Total between 50 and 70 wins

Extra Support

Y1: Spider Adds
Adding 10 to 2-digit numbers.

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