Short Blocks

Maths Year 3 Autumn Addition and Subtraction (A)

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

Number facts and inverse operations (suggested as 2 days)

Planning and Activities

Day 1 Teaching
Use different sets of objects, including pegs on a coat hanger, to partition 12 into 2 sets. Then use bar diagrams and write 4 sentences. Learn the facts.
Group Activities
Use the in-depth problem-solving investigation ‘Are you well balanced?’ from NRICH as today’s group activity.
Or, use these activities:
-- Find as many ways of making given numbers.
-- Consolidate number bonds to 10 and 20.

Day 2 Teaching
Use the NRICH balances to show equality and use this to rehearse number facts. Write these facts as number sentences, using +, = and also – signs.
Group Activities
-- Play ‘what’s in the box’ exploring different number fact sentences.

You Will Need

  • Coat hanger and 12 pegs (2 colours)
  • Bar model pictures for pairs to 6, 7, 8, 9 & 12 (see resources)
  • Number balance (or an interactive one)
  • Small items for hiding, boxes or bags to hide items in

Mastery: Reasoning and Problem-Solving

  • Write 4 number sentences to relate these 3 numbers: 13, 19 and 6.
  • We know 13 + 7 = 20. So what is 130 + 70?
    We know 11 + 9 = 20. So what is 110 + 90?
    Write an addition with an answer of 20.
    Write a similar addition with an answer of 200.
    Repeat this.
  • Write three different ways of making 14 by adding two 1-digit numbers.

In-depth Investigation: Are You Well Balanced?
Hang combinations of weights to make the scale balance. Are You Well Balanced? from nrich.maths.org.

Extra Support

Perfect Pairs
Addition facts for 6, 7, 8, 9 and 10

Patterns Practice
Using addition facts to add single-digit numbers to 2-digit numbers, e.g. using 5 + 3 = 8 to work out 25 + 3 (not crossing 10s)