Edexcel IGCSE Math A Higher 1.9 Ha Problems Involving Standard Form Questions

Practise combining, comparing and scaling quantities in standard form before giving the result in the required accuracy.

Exam points

combine coefficients and powers of ten, then normalise the final standard form
align powers before adding or subtracting quantities written in standard form
divide two quantities to find a scale factor and round it to the stated accuracy

[Maximum number: 2]

The table gives information about the population, correct to 2 significant figures, of each of five cities in 2018

Table for Question Edexcel IGCSE Math A Higher 1.9 Ha Problems Involving Standard Form Questions question 1 — Edexcel IGCSE Math A Higher

Work out the difference between the population of Tokyo and the population of Ahmedabad in 2018
Give your answer in standard form correct to 2 significant figures.

Difference:
$3.7\times10^{7}-7.7\times10^{6}=29300000$

In standard form to 2 significant figures:
$2.9\times10^{7}$

Accept $2.93\times10^{7}$ , and the corresponding negative values if subtraction order is reversed.

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Edexcel IGCSE Math A Higher 1.9 Ha Problems Involving Standard Form Questions question 1