topic badge
iGCSE (2021 Edition)

1.06 Check reasonableness of calculations

Interactive practice questions

Which of the following is closest to the sum $23+42+34$23+42+34?

$10$10

A

$100$100

B

$1000$1000

C
Easy
< 1min

Which of the following is closest to the sum $97+98+89$97+98+89?

Easy
< 1min

Which of the following is closest to $99+98-87$99+9887?

Easy
< 1min

Is the following sum close to $1000$1000?

$948+827+18$948+827+18

Easy
< 1min
Sign up to access Practice Questions
Get full access to our content with a Mathspace account

Outcomes

0580C1.9A

Make estimates of numbers, quantities and lengths and round off answers to reasonable accuracy in the context of a given problem.

0580C1.13

Use a calculator efficiently. Apply appropriate checks of accuracy.

0580E1.9A

Make estimates of numbers, quantities and lengths and round off answers to reasonable accuracy in the context of a given problem.

0580E1.13

Use a calculator efficiently. Apply appropriate checks of accuracy.

What is Mathspace

About Mathspace