Short Blocks

Maths Year 2 Spring More Addition & Subtraction

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

Find change (suggested as 2 days)

Planning and Activities

Day 1 Teaching
Display a pen priced 45p. Say you will buy this and pay with 50p. Use a 0–50 line to show how we can count up from 45p to 50p to find change. Show how we can cross out 0–45 and see what is left. Repeat with a sharpener costing 48p. Show that if you spent 2p, you would get 48p change. Repeat for 43p.
Group Activities
-- Find change from 50p when buying items that cost forty-something pence.
-- Find change from 10p.

Day 2 Teaching
Show a problem. Matthew had £17 and spent £15 on an art set. How much money has he left? Mark 17 on a 0–20 beaded line. Emphasise that Matthew spent £15, so cross out 0–15. Explain that he has 2 left. Show lines of 15 and 17 on ITP Difference to reinforce. Repeat with a spend of £14.
Group Activities
Use the in-depth problem-solving investigation ‘Combining Coins’ from NRICH as today’s group activity.
Or, use this activity:
-- Find the difference between two 2-digit numbers by counting up.
-- Decide whether to count up or back to find change in pounds.

You Will Need

  • Pen labelled with the price of 45p
  • Sharpener labelled 43p
  • 0–50p penny line (see resources)
  • ‘Finding change from 50p’ sheet (see resources)
  • Lines of 15 and 17 on ITP Difference (see resources)
  • Additional activity sheets (see resources)
  • 10–30 number cards

Mental/Oral Maths Starters

Day 1
Bonds to 10 (pre-requisite skills)

Day 2
Add to next 10 (pre-requisite skills)

Worksheets

Day 1
Calculate and write subtraction sentences for change from 10p, 20p or 50p.

Day 2
Calculate how much pocket money is left by finding the difference; decide whether to count up or back to find a difference.

Mastery: Reasoning and Problem-Solving

  • Complete each sentence by writing the missing numbers.
    47p + ☐ = 50p
    ☐ + 39p = 50p
    50p = ☐ + 45p
  • Write the missing number in each bar diagram:
    Diagram 1

£18
£13?

Diagram 2

£21
?£17

Diagram 3

£19
£12?
  • Caitlyn has spent £15. She has £6 left. How much did she have to start with?

In-depth investigation: Combining Coins
Is it always possible to make a total using every number of coins between the minimum and the maximum possible numbers? Combining Coins (first activity) from nrich.maths.org.