Short Blocks

Maths Year 2 Summer Addition & Subtraction

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

Add by partitioning or counting on (suggested as 2 days)

Planning and Activities

Day 1 Teaching
Children make 24 and 32 using place value cards. Model this process using Place value ITP. Demonstrate how to add the two 10s and the two 1s and then recombine: 30 + 20 = 50 and 2 + 4 = 6. Total = 56. Also show how to count on in 10s and 1s (start at 32; add 20 then 4): 32..42..52..53..54..55..56. Which strategy do you prefer? Ask children to work out 73 + 21, 52 + 37, 54 + 26. Model 47 + 35 using partitioning, to show what happens when the ones add to more than ten.
Group Activities
-- Add two 2-digit numbers from number cards, noting methods used.
-- Add two 2-digit numbers from dice, explaining reasons for methods used.

Day 2 Teaching
Remind children of the two methods they used in Day 1 for adding: partitioning and counting on. Practise adding two 2-digit numbers, allowing children to choose their preferred method. Ask two children using different methods to explain why they used the method they chose.
Group Activities
Use the in-depth problem-solving investigation ‘Diagonal hundreds’ as today’s group activity.
Or, use these activities:
-- Add two 2-digit numbers from spinners, choosing appropriate methods.
-- Add two 2-digit numbers, suggesting the method to be used and devising ‘top tips’ for method selection.

You Will Need

  • Place value cards
  • Place value ITP
  • Whiteboards and pens
  • 2-digit number cards
  • 10 second timer
  • Calculators
  • Customised dice (see activity for details)
  • Top Marks spinners from
  • Mobile internet access devices

Mental/Oral Maths Starters

Day 1
Add a 1-digit number to a 2-digit number (pre-requisite skills)

Day 2
Subtract a 1-digit number from a 2-digit number (pre-requisite skills)


Day 1
Select appropriate methods to add two 2-digit numbers.

Day 2
Select appropriate methods to add two 2-digit numbers for more challenging calculations.

Mastery: Reasoning and Problem-Solving

Look at this bar diagram. Work out the value of the missing number:

  • Explain why it might help to change the order of this addition before we try to find the answer.
    15 + 62 = ☐
  • Would you use counting on or partitioning to work out these additions? Why? Find the answers.
    35 + 57
    77 + 22
    84 + 6
  • Sam had some stickers. His sister takes 22 and he gives his friend 45. He has none left. How many did he start with?

In-depth Investigation: Diagonal hundreds
Children use trial and improvement to place numbers in a grid to give a pair of diagonals whose sum is equal to 100.

Extra Support

Square Sums
Adding ‘friendly’ 2-digit numbers using partitioning (1s<10)