Money Calculations

Adding values ending with 9:

£4.99 + £2.75 =

Round £4.99 to £5 and then add £2.75; answer will be £7.75

As you have added 1p to £4.99 when you rounded it to £5, you have to take away 1p from £7.75. So, final answer is £7.74

£3.29 + £2.20 =

Round £3.29 to £3.30 and then add £2.20; answer will be £5.50

As you have added 1p to £3.29 when you rounded it £3.30, you have to take away 1p from £5.50. So, final answer is £5.49

Now try these problems:

1. £7.49 + £3.50 =

2. £8.69 + £4.20 =

3. £11.29 + £3.26 =

4. £56.49 + £25.20 =

5. £34.79 + £46.20 =

6. £49.25 + £26.89 =

7. £57.28 + £22.19 =

8. £28.35 + £28.39 =

Facts:

0.5 + 0.5 = 1

0.25 + 0.75 = 1

0.75 + 0.5 = 1.25

0.75 + 0.75 = £1.50

So 50p + 50p = £1

     25p + 75p = £1

     75p + 50p = £1.25

     75p + 75p = £1.50

Example: £4.50 + £3.50 =

£4.00 + £3.00 = £7.00

£0.50 + £0.50 = £1.00

So, answer is £7.00 + £1.00 = £8.00

Now try these problems:

1. £3.25 + £4.75 =

2. £9.25 + £3.75 =

3. £14.50 + £3.75 =

4. £12.50 + £2.75 =

5. £16.75 + £3.50 =

6. £18.25 + £13.50 =

7. £36.75 + £24.25 =

8. £49.50 + £29.50 =

9. £27.25 + £19.75 =

10. £39.75 + £49.75 =

Facts:

£1.00 - 50p = 50p = £0.50

£1.00 - 25p = 75p = £0.75

£1.00 - 75p = 25p = £0.25

Example:

£8.00 - £0.25

Split £8 into £7 and £1

Take away 25p from £1 which will be 75p

Now you have £7 and 75p

So, answer is £7.75

Example: £15 - £3.25

Step 1: Split £3.25 into £3 and 25p

Step 2: £15 - £3 = £12

Step 3: £12 - 25p = £11.75

Now try these problems

1. £15 - 50p =

2. £35 - 75p =

3. £45 - £1.25 =

4. £27 - £2.50 =

5.  £19 - £3.75 =

6. £35 - £2.50 =

7. £46 - £3.50 =

8. £65 - £5.50 =

9. £40 - £5.25 =

10. £20 - £4.75 =