This deep dive covers Method: Multiplying Decimals within Integers & Decimals for GCSE Mathematics. Revise Integers & Decimals in Number for GCSE Mathematics with 14 exam-style questions and 22 flashcards. This topic appears regularly enough that it should still be part of a steady revision cycle. It is section 5 of 13 in this topic. Use this deep dive to connect the idea to the wider topic before moving on to questions and flashcards.
Method: Multiplying Decimals
1
Multiply ignoring decimal points: 2.3 × 1.5 → 23 × 15 = 345
2
Count total decimal places in question: 1 + 1 = 2 places
3
Place decimal point in answer: 345 → 3.45
4
Check: Estimate 2 × 1.5 = 3, so 3.45 is reasonable
Practice questions for Integers & Decimals
What is the value of the digit 4 in the number 12.345?
Explain how to multiply two decimal numbers without a calculator.
Quick recall flashcards
Money calculation
£4.25 + £12.30 + £8.75
Line up decimals:
4.25
12.30
+ 8.75
------
25.30
Answer: £25.30
What is a decimal?
A number with a decimal point showing parts of a whole. The digits after the point represent tenths, hundredths, thousandths, etc.