Rounding & Estimation (Cambridge International IGCSE Maths): Exam Questions

Write 0.3728 correct to 1 decimal place.

Write 867 correct to the nearest ten.

Write 849.481 correct to 1 decimal place.

Write 97.4236 correct to 3 decimal places.

Write 3.72194 correct to 3 decimal places.

Write 8379 correct to the nearest hundred.

Write 6789 correct to the nearest 100.

Write 6789 correct to 3 significant figures.

Write 8473 correct to the nearest ten.

Write 16.086 correct to 2 decimal places.

Write 3.058 correct to 3 significant figures.

By writing each number correct to 1 significant figure, estimate the value of

$\frac{37.8\times13.2}{28.5+22.1}$

You must show all your working.

By rounding each number correct to 1 significant figure, estimate the value of

$\frac{71\times32.4}{4.8^{2}}$

You must show all your working.

Calculate $\sqrt[3]{40}$

Give your answer correct to 4 decimal places

By rounding each number correct to 1 significant figure, show that an estimate for this calculation is 20.

$\frac{9.78+31.562}{0.381\times5.09}$

Write 0.047883 correct to 2 significant figures.

Write 6.8167 correct to 3 significant figures.

$T=\frac{49.2-9.59}{4.085\times2.35}$

By writing each number correct to 1 significant figure, work out an estimate for $T$. You must show all your working.

By rounding each number correct to 1 significant figure, estimate the value of $\sqrt{\frac{90006}{10.01^{2}}}$

You must show all your working.

$p=\frac{1.6+9.6^{2}}{5.9-4.3}$

By writing each number correct to 1 significant figure, work out an estimate for $p$. You must show all your working.

Write 0.046875 correct to 2 significant figures.

Without using a calculator, estimate, by rounding each number correct to 1 significant figure,

$\frac{\sqrt{104.3}}{8.72-7.389}$

You must show all your working.