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


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

Coming soon

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).