Estimation

Do not use your calculator; round every number to 1 significant figure.

Feb/March 2017

Estimate the value of $\dfrac{10.3 \times 19.5}{88.9 - 43.2}$, without using your calculator, after rounding each number to 1 significant figure. Show all your working.

Feb/March 2017

Without using a calculator, work out an estimate for $\frac{\sqrt{104.3}}{8.72 - 7.389}$ by rounding each number to 1 significant figure. Show all your working.

Feb/March 2019

By rounding each number to 1 significant figure, determine an estimate for the value of $\frac{2.8 \times 82.6}{27.8 - 13.9}$.

Feb/March 2021

The relation is $D = \sqrt{\dfrac{1.95 \times 9.92^2}{8.07}}$.

Feb/March 2025

The equation is $p = \dfrac{1.6 + 9.6^2}{5.9 - 4.3}$.

May/June 2019

Estimate the value of $\dfrac{38.7\times3.115}{20.3-4.1^2}$ by rounding every number in the calculation to 1 significant figure. Show all your working.

May/June 2021

After rounding each number in the calculation to 1 significant figure,

May/June 2022

Find an estimate for the value of $\dfrac{6.7 \times 2.1}{18 - 5.9}$ by first changing every number in the calculation to 1 significant figure. Show all your working.

May/June 2023

Use each number in the calculation rounded to 1 significant figure to find an estimate for the value of $\frac{28.2 - 5.6}{4.2 \times 1.68}$. You must show all your working.

May/June 2024

By first rounding each number in the calculation correctly to 1 significant figure, find an estimate for the value of $\frac{42.8 + 17.4}{1.97 \times 5.79}$.

May/June 2025

Estimate the value of $\frac{17.8 + 10.3}{5.5}$ by first changing each number in the calculation to 1 significant figure.

May/June 2025

Using 1 significant figure for each number in the calculation, estimate the value of $\dfrac{62.5}{9.7 \times 0.52}$.

May/June 2025

Using each number rounded correctly to 1 significant figure, estimate the value of $\dfrac{\sqrt{3.9 \times 29.3}}{8.9 - 2.7}$. Show all your working.

Oct/Nov 2015

Use each number rounded to 1 significant figure to estimate the value of $\frac{\sqrt{3.9 \times 29.3}}{8.9 - 2.7}$. Show all your working.

Oct/Nov 2015

Use values rounded to 1 significant figure to estimate $\frac{59.2 \times 1.97}{2.04 + 3.85}$.

Oct/Nov 2017

$T = \dfrac{49.2 - 9.59}{4.085 \times 2.35}$

Oct/Nov 2020

Use each number correct to $1$ significant figure to estimate $\dfrac{37.8 \times 13.2}{28.5 + 22.1}$. Show every step of your working.

Oct/Nov 2020

Let $T = \frac{49.2 - 9.59}{4.085 \times 2.35}$.

Oct/Nov 2020

Sophie purchases 73 books for her school, and each book is priced at $21.95.

Oct/Nov 2021

Using each number in the calculation rounded correctly to 1 significant figure, estimate the value of $\frac{5.3\times19.5}{2.49}$.

Oct/Nov 2025

Write 46.179 rounded to 4 significant figures.

Oct/Nov 2025