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Estimating an answer

Estimating an answer. remember to round first before you do the sum. At the sweet shop look at the prices . Mars 33p Polo 23p Twix 28p Gum 45p Estimate the price of a Mars and a Polo. Remember to round the prices first. At the sweet shop : first round the prices .

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Estimating an answer

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  1. Estimating an answer remember to round first before you do the sum

  2. At the sweet shop look at the prices Mars 33p Polo 23p Twix 28p Gum 45p Estimate the price of a Mars and a Polo Remember to round the prices first

  3. At the sweet shop : first round the prices Mars 33p Polo 23p Twix 28p Gum 45p Estimate the price of a Mars and a Polo 30p + 20p = 50p Why round to 10p?

  4. Estimating an answer remember to round first before you do the sum • What will you round to? Look at the number and decide what makes sense? • Whatever you choose stick to it!

  5. At the sports shop look at the prices shorts £12.50 tee shirt £8.35 socks £5.60 hat £4.50 Estimate the price of a hat and socks

  6. At the sports shop: first round the prices shorts £12.50 tee shirt £8.35 socks £5.60 hat £4.50 Estimate the price of a hat and socks £5 + £6 = £11 Why round to £1?

  7. At the sports shop: look at the prices shorts £12.50 tee shirt £8.35 socks £5.60 hat £4.50 Estimate the price of shorts and a tee shirt

  8. At the sports shop: first round the prices shorts £12.50 tee shirt £8.35 socks £5.60 hat £4.50 Estimate the price of shorts and a tee shirt £10 + £10 = £20 Why round to £10?

  9. At the computer shop look at the prices printer £112.50 memory £58.35 keyboard £35.60 monitor £154.50 Estimate the price of two keyboards and extra memory

  10. At the computer shop: first round the prices printer £112.50 memory £58.35 keyboard £35.60 monitor £154.50 Estimate the price of a two keyboards and extra memory £40 + £40 + 60 = £140 Why round to £10?

  11. At the computer shop look at the prices printer £112.50 memory £58.35 keyboard £35.60 monitor £154.50 Estimate the price of a printer and a monitor

  12. At the computer shop: first round the prices printer £112.50 memory £58.35 keyboard £35.60 monitor £154.50 Estimate the price of a printer and a monitor £100 + £200 = £300 Why round to £100?

  13. Estimating an answer remember to round first before you do the sum round all to the same degree of accuracy then do the sum

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