Standard form - Standard form is when a number is written in the form A × 10^n, (where 1 ≤ A < 10 and n is an integer).

Subtracting numbers in standard form

Maths

In the prior unit, pupils formalised their understanding of the index laws. This understanding will allow them to perform calculations with values written in standard form more efficiently.

Standard form calculations

Work out $$9.8\times10^5 - 6.8\times10^5 $$, giving your answer in standard form.

Work out $$3\times10^{-8} - 1.8\times10^{-8} $$, giving your answer in standard form.

Work out $$2.4\times10^7  - 3\text{ } 700\text{ }000$$, giving your answer in standard form.

Work out $$4.9\times10^6- 280\text{ }000$$, giving your answer in standard form.

Work out  $$9.38 \times 10^{10} -  1 \text{ } 300 \text{ } 000 \text{ } 000$$. Give your answer in standard form.

 $$9$$ mm − $$ 0.5$$ cm  − $$2\times10^{-3}$$ m = {{}} metres.

Match each number in standard form to its equivalent ordinary number.

Without a calculator, work out 3.42 – 1.23.

Without a calculator, work out 28.48 – 3.203.

Without a calculator, work out 12.4 – 2.42 + 4.64.

Match each number to a correct statement about that number.

This lesson will soon be taken down.

Subtracting numbers in standard form

Lesson outcome