به انگلیسی

Rounding Answers to the Right Accuracy

Mathematics · Multiplication & Division · ages 10-11

Name ______________________ Date ____________

How many decimal places does an amount of money in pounds need, since a penny is the smallest unit?
- 1
- 2
- 3
To round a number to one decimal place, which digit tells you whether to round up or down?
- The second decimal digit
- The first decimal digit
- The whole number digit
If you calculate that 3.25 boxes are needed and boxes cannot be split, you should round down to 3.
Circle one: True False
A cafe splits a £9.20 bill evenly between 3 friends. What does each friend pay, rounded to the nearest penny?
- £3.06
- £3.00
- £3.07
Divide 19 by 8. Round your answer to one decimal place.
Answer: ______________
A minibus seats 15 people. 47 people are going on a trip. How many minibuses are needed?
- 4
- 3
- 3.13
Seven friends share 100 minutes of game time equally. The timer only takes whole minutes. About how long does each friend get?
- 14.2857 minutes, rounded to four decimal places
- 14.3 minutes, rounded to one decimal place
- 14 minutes, to the nearest whole minute
Tom needs 6-seat tables for 52 guests. He calculates 52 divided by 6 is 8.6666... and rounds it to 8.7 tables. What mistake did Tom make?
- He rounded to the wrong number of decimal places
- He should have rounded up to 9 whole tables, not 8.7
- He divided the numbers incorrectly

Answer key

For grown-ups. Fold this page away before handing over the rest.

2 · Money is written to 2 decimal places because a penny is one hundredth of a pound.
The second decimal digit · The digit right after the one you are rounding to tells you whether to round up or keep it the same.
False · You cannot use part of a box, so you must round up to 4 whole boxes, even though 3.25 would usually round down.
£3.07 · £9.20 divided by 3 is £3.0666... The third decimal digit is 6, so the pennies round up to £3.07.
2.4 · 19 divided by 8 is 2.375. The digit after the tenths place is 7, which rounds the 3 up to 4, giving 2.4.
4 · 47 divided by 15 is 3.13 minibuses. People cannot share a partial bus, so you need to round up to 4 whole minibuses.
14 minutes, to the nearest whole minute · Each friend gets 100 divided by 7, which is 14.2857... minutes. The timer only takes whole minutes, so 14.3 minutes cannot be set. Rounded to the nearest whole minute, that is 14 minutes.
He should have rounded up to 9 whole tables, not 8.7 · Tables cannot be split into decimals, so Tom needed to round up to a whole number of tables: 9, not a decimal answer.