Short Blocks

Maths Year 2 Autumn Addition and Subtraction

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

Addition/subtraction facts; missing nos (suggested as 3 days)

Planning and Activities

Day 1 Teaching
Show a number balance with weights: 6 one side and 10 on the other. If you hang a weight on LHS it’ll balance. Balance 6 and 4 with 10. Record 6 + □ = 10. Discuss how 4 goes in the box. Repeat for other bonds to 10. Then for 9, 8 and 7.
Group Activities
Use the ‘Addition Towers’ in-depth problem-solving investigation below as today’s group activity.
Or, use these activities:
-- Children use balance bars to create balanced number sentences up to 10.

Day 2 Teaching
Show a bead frame (2 rows of 10 beads) or a bead string (20 beads). Hide a number of beads and ask children to say missing number. Record with a missing number sentence: 15 + [_] = 20. Repeat for other bonds to 20.
Group Activities
-- Children find missing numbers to create a pair of numbers that add up to 20.

Day 3 Teaching
Show picture of a strip of 10 red cubes with a strip of 6 blue and 4 yellow cubes below (see resources) or use real interconnecting cubes. Demonstrate pairs to 10 and 20. Write related addition and subtraction facts.
Group Activities
-- Children use bar models to create pairs of numbers that add up to 10 and 20, using inverse operations.

You Will Need

  • 1-100 grid (see resources)
  • Ten 2-digit number cards
  • Number balance, or number balance from
  • 1-10 number cards
  • 20 bead frame, 20 bead strings
  • Five ‘Slidy box’ cards
  • Additional activity sheets (see resources)
  • Interconnecting cubes, e.g. multilink

Mental/Oral Maths Starters

Day 1
Pairs to 10 (pre-requisite skills)

Suggested for Day 2
Say one more or one less than any 2-digit number (simmering skills)

Suggested for Day 3
Place value in 2-digit numbers (simmering skills)


Day 1
Children explore the different ways to find a total of 10 using 2 or 3 numbers.

Day 2
Children find the missing numbers for totals of 10 and 20.

Day 3
Children explore possible solutions to find a total of 20.

Mastery: Reasoning and Problem-Solving

  • Write the pairs of possible missing numbers.
  • How many different ways are there of writing numbers in the 2 boxes in this sentence?
    ☐ + ◯ = 10
    What about if the 2 boxes = 9? Or = 8?
  • You have 21 cards - 0 to 20. You can create how many pairs of numbers making 20? Write these. Write the pair you cannot create.
  • Cuisenaire counting’ activity from

In-depth Investigation: Addition Towers
Children find the total number of spots on 2 dice in a game context, and consider why some totals come up more frequently than others.

Extra Support

10 Totally Rocks
Finding pairs with a total of 10