GCSE Maths (Edexcel)

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Number Structure and calculation

Multiplying Decimal Numbers

4:46 apply the four operations, including formal written methods, to integers, decimals and simple fractions (proper and improper), and mixed numbers – all both positive and negative; understand and use place value (e.g. when working with very large or very small numbers, and when calculating with decimals)
Spec N2
Previous Dividing by 0.1 Next Dividing Decimal Numbers
  • Multiplying decimal numbers can be complicated
  • A method to simplify multiplying decimals is to convert them into whole numbers first
  • Example: 5.72 times 1.2
  • Step 1: Multiply the numbers by 10 until they become integers
  • Step 2: Multiply the unit on the bottom by every digit on the top
  • Step 3: Multiply the 10 on the bottom by every digit on the top
  • Step 4: Add up the final two rows from units to thousands
  • Step 5: Count the number of decimal places in each factor
  • Step 6: Put the same total number of decimal places back into the answer using a decimal point
  • The answer to 5.72 times 1.2 is 6.864

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264

questions for Number

210

questions for Structure and calculation