CAIE IGCSE Mathematics C1.8.1 Use the standard form A × 10n where n is a positive or negative integer

Practise recognising standard form A x 10^n, comparing powers of 10 and explaining why a given value is or is not valid.

Exam points

explain that standard form requires 1 <= A < 10 when rejecting a number like 85.1 x 10^4
compare standard form numbers by checking the power of 10 before using the value of
identify the largest or smallest value from a list that mixes valid and invalid standard form

[Maximum number: 1]

$\quad 9.78 \times 10^{8} \quad 2.04 \times 10^{9}$

Which of these two numbers is larger?
Give a reason for your answer. is larger because

$2.04\times10^9$ , and it has the larger power of 10 oe

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