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Step-by-step practice: Maths · Level 2Chapter 10 · Level 2 check
Step-by-step Maths Level 2 · Level 2 check · Lesson 10.3

Step-by-step Maths Level 2: Adding, subtracting, money and time

Part of the Step-by-step Maths Level 2 level 2 check chapter. Chapter overview · whole chapter on one page

10.3

Adding, subtracting, money and time

Level 2
Add and subtract within 100 without carrying, Use coins, notes and the time to the hour and half past

Add or subtract the tens and the ones separately when no carrying or exchange is needed. Use money and time in the same careful way.

Key ideas

  • Add the tens and the ones.
  • Subtract the tens and the ones.
  • 100p is £1.
  • Read the hour hand first.
Worked example 10.3.1
Work out 23 + 45.

Method. Add the tens, then add the ones. Put the two answers together.

  1. Add the tens: 2 tens + 4 tens. Each ten is worth ten.
    2 + 4 = 6 tens, which is 60
  2. Add the ones: 3 + 5. The ones are added separately.
    3 + 5 = 8
  3. Put them together: 60 + 8. The tens and ones make the total.
    60 + 8 = 68
  4. Write the answer.
    68

Check. Count on from 23: you reach 68.

Watch out. Add the tens to the tens and the ones to the ones. Do not add the ones digit to the tens.

Worked example 10.3.2
Work out 68 - 23.

Method. Take away the tens, then take away the ones. Put the two answers together.

  1. Take away the tens: 6 tens - 2 tens. We take the tens from the tens.
    6 - 2 = 4 tens, which is 40
  2. Take away the ones: 8 - 3. We take the ones from the ones.
    8 - 3 = 5
  3. Put them together: 40 + 5. The tens and the ones make the answer.
    40 + 5 = 45
  4. Write the answer.
    45

Check. Add back: 45 + 23 = 68. It is right.

Watch out. Take the ones from the ones and the tens from the tens. Do not take the ones from the tens.

Worked example 10.3.3
A pack of cards costs 35p. I pay with 50p. How much change do I get?

Method. Count on from the price to the amount paid. The steps you count are the change.

  1. Start at the price, 35p. That is what the item costs.
    35p
  2. Count on to 50p. The steps you count are the change.
    35p + 15p = 50p
  3. Write the change. This is the money you get back.
    15p

Check. 35p and 15p together make 50p.

Watch out. Change is the money you get back, not the price of the item.

Watch out

Watch out. Keep the tens and ones apart. Check your change by counting on from the price.

Exam tip

Grown-up tip. Ask the child to show the sum with tens sticks and ones cubes before writing it down.

Exercise 10C  Mixed practice: sums, money and time

Non-calculator
1
PSA pencil costs 20p. I pay with £1. How much change do I get?
2
PSA apple costs 5p. I pay with 50p. How much change do I get?
3
FWork out 95 - 53.
4
FWrite 322p in pounds and pence.
5
FWhat day comes after Saturday?
6
FHow many pence is £4.55?
7
FWork out 78 - 68.
8
FWrite six o'clock in digital form.
9
FWork out 18 + 71.
10
FWork out 59 - 11.
11
FWork out the answer. Set it out in columns: 24 + 65
2465+
12
FHow many pence is £1.88?
13
FWhich month comes after October?
14
FWhat day comes after Thursday?
15
FWhat day comes before Saturday?
16
FWork out 49 - 33.

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