Rounding

Write 23 619 to the nearest 1000

Work out an estimate for the value of 5.9 98.1

Use your calculator to work out the value of

Give your answer as a decimal. Write down all the figures on your calculator display.

Write your answer to part (a) correct to 2 significant figures.

Karim rounds a number, n, to 1 decimal place. The result is 23.8 Complete the error interval for n.

Karim rounds a number, n, to 1 decimal place. The result is 23.8 Complete the error interval for n.

Give your answer correct to 3 significant figures.

Jana used her calculator to find the value of a number t. The answer on her calculator began 10.2 Complete the error interval for t.

Jana used her calculator to find the value of a number t. The answer on her calculator began 10.2 Complete the error interval for t.

Write the number 18 475 correct to the nearest thousand.

Write down all the numbers on your calculator display.

Write your answer to part (a) correct to 2 significant figures.

A number N is rounded to 2 significant figures. The result is 7.3

Write down the least possible value of N.

Leila says, “The value of N cannot be greater than 7.349 because 7.350 would round up to 7.4”

Is Leila correct? You must give a reason for your answer.

Give your answer as a decimal. Write down all the figures on your calculator display.

Write your answer to part (a) correct to 2 decimal places.

A number x is written correct to 2 significant figures. The result is 1.9 Complete the error interval for x.

Write 8061 correct to the nearest hundred.

Write 6184 correct to the nearest hundred.

Asha buys 180 cans of cola. The cans are sold in packs. There are 12 cans in each pack. Each pack costs £3

Work out the total cost of the cola Asha buys.

Ethan buys a box of 24 cans of lemonade for £7 There are 330 ml of lemonade in each can.

Work out the cost of 100 ml of lemonade. Give your answer correct to the nearest penny.

A number, d, is rounded to 1 decimal place. The result is 12.7 Complete the error interval for d.

A number, d, is rounded to 1 decimal place. The result is 12.7 Complete the error interval for d.

120 boxes cost £6 270 bags cost £10 A bag is cheaper than a box. How much cheaper? Give your answer in pence correct to 1 decimal place.

Jonny wants to know how much coffee he will need for 800 people at a meeting. Each person who drinks coffee will drink 2 cups of coffee. 10.6 g of coffee is needed for each cup of coffee. Jonny assumes 68% of the people will drink coffee.

Using this assumption, work out the amount of coffee Jonny needs. Give your answer correct to the nearest gram.

Jonny’s assumption is wrong. 72% of the people will drink coffee.

How does this affect your answer to part (a)?

Find the value of the reciprocal of 0.8

x = 4700 correct to 2 significant figures.

Complete the error interval for x.

Write 19.4949 correct to the nearest whole number.

Write 87 569 correct to 3 significant figures.

Give your answer as a decimal.

Martin used his calculator to work out the value of a number P. He wrote down the first two digits of the answer on his calculator. He wrote down 1.2 Complete the error interval for P.

Write 1476 to the nearest 10

The length of a football pitch is 90 metres, correct to the nearest metre. Complete the error interval for the length of the football pitch.

_........ m length <_........

The length of a football pitch is 90 metres, correct to the nearest metre. Complete the error interval for the length of the football pitch.

_........ m ≤ length <_........

Use your calculator to work out

Give your answer correct to 3 significant figures.

Write 2530 correct to 2 significant figures.

Write 0.0874 correct to 1 significant figure.

Write 327 correct to the nearest ten.

Freddie measured the length of a pencil as 7.2 cm correct to 1 decimal place. Complete the error interval for the length, pcm, of the pencil.

Write down all the figures on your calculator display.

Give your answer to part (a) correct to 2 decimal places.

Freya writes down the value of x, correct to 1 decimal place. She writes x = 6.4 Complete the error interval for x.

Write 4.666 correct to the nearest whole number.

Write 29 381 correct to the nearest 1000

A number, m, is rounded to 1 decimal place. The result is 9.4 Complete the error interval for m.

A number, m, is rounded to 1 decimal place. The result is 9.4 Complete the error interval for m.

10A person’s heart beats approximately 10⁵ times each day. A person lives for approximately 81 years.

Work out an estimate for the number of times a person’s heart beats in their lifetime. Give your answer in standard form correct to 2 significant figures.

2 × 10¹² red blood cells have a total mass of 90 grams.

Work out the average mass of 1 red blood cell. Give your answer in standard form.

Write 4.58 correct to 1 decimal place.

The length of a pencil is 128 mm correct to the nearest millimetre.

Complete the error interval for the length of the pencil.

Write down all the figures on your calculator display.

Write your answer to part (a) correct to 4 significant figures.

Write down all the figures on your calculator display.

Write your answer to part (a) correct to 4 significant figures.

Liquid A and liquid B are mixed together in the ratio 2: 13 by volume to make liquid C.

Liquid A has density 1.21 g/cm³ Liquid B has density 1.02 g/cm³

A cylindrical container is filled completely with liquid C. The cylinder has radius 3 cm and height 25 cm.

Work out the mass of the liquid in the container. Give your answer correct to 3 significant figures. You must show all your working.

Sally used her calculator to work out the value of a number y. The answer on her calculator display began 8.3 Complete the error interval for y.

Sally used her calculator to work out the value of a number y. The answer on her calculator display began 8.3 Complete the error interval for y.

Write 478 to the nearest hundred.

Write 7829 to the nearest 1000

Martin truncates the number N to 1 digit. The result is 7

Write down the error interval for N.

Write 7357 correct to 3 significant figures.

Write down all the figures on your calculator display.

Write 7357 correct to 3 significant figures.

Write down all the figures on your calculator display.

Write 6324 correct to the nearest thousand.

Write 1.59 correct to 1 decimal place.

Here is a triangular prism.

Work out the volume of the prism. Give your answer correct to 3 significant figures.

Write the number 2538 correct to the nearest hundred.

Write down all the figures on your calculator display.

Write your answer to part (a) correct to 2 decimal places.

Write 3758 correct to the nearest 1000

A gold bar has a mass of 12.5 kg.

The density of gold is 19.3 g/cm³

Work out the volume of the gold bar. Give your answer correct to 3 significant figures.

Find the value of the reciprocal of 1.6 Give your answer as a decimal.

Jess rounds a number, x, to one decimal place. The result is 9.8

Write down the error interval for x.

Find the value of the reciprocal of 1.6 Give your answer as a decimal.

Jess rounds a number, x, to one decimal place. The result is 9.8

Write down the error interval for x.

Write 7.264 51 correct to 3 decimal places.

A number, n, is rounded to 2 decimal places. The result is 4.76

Using inequalities, write down the error interval for n.

Harley’s house has a value of £160 000 correct to 2 significant figures.

Write down the least possible value of the house.

Write down the greatest possible value of the house.

The value of Rita’s house increased by 5%. Her house then had a value of £210 000

Work out the value of Rita’s house before the increase.