Module 3 Calculating
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Can I multiply a two-digit number by a one-digit number?

Example review questions

  • What is double 37? Did you record anything to help you find your answer?
  • Rulers are 30 cm long. If you place six of them end to end, how long a line will they make? What did you write down?
  • Jot down the facts you could use to work out 4 × 12.
  • Find 13 lots of 3. Use a number line to show this calculation.
  • What is the cost of three packs of raisins at 21p for each pack? Use resources, draw a picture or make notes to help you work out your answer.

Teaching guidance

This teaching guidance document suggests some of the key vocabulary, models, images and practical equipment that children should experience and be able to use. It also includes some teaching tips to provide a few starting points for ways of supporting children with this area of mathematics.

DOC file Can I multiply a two-digit number by a one-digit number? - teaching guidance | 1230KB new window

Consolidation and practice

These resources are to support children in guided or independent work. Roll over the highlighted resources for a description.

PDF file How to use multiplication grid ITP | 145KB new window

SWF file Multiplication grid ITP | 26KB new window

PDF file How to use multiplication array ITP | 116KB new window

SWF file Multiplication array ITP | 40KB new window

XLS file Doubling and halving | 162KB new window

DOC file Using doubling teaching prompts | 51KB new window

Multiplication grid

itp_multiplication_grid.png

This interactive teaching program (ITP) is an ICT-based tool to support the exploration of multiplication. Multiplication grid ITP allows the child or teacher to demonstrate the grid method of multiplication for whole and decimal numbers. The ITP can be used to develop children's abilities to apply their knowledge of number facts and to deduce and reason, when finding missing component numbers.

Multiplication array

itp_multiplication_array.png

This interactive teaching program (ITP) is an ICT-based tool to support the exploration of multiplication. Multiplication array ITP allows the child or teacher to uncover a section of an array of counters, dropping on grid lines to explore methods of multiplication.

Opportunities to use and apply

Possible contexts include:

  • word problems involving money and measures, e.g. An exercise book is 15 mm thick. How thick will a pile of five exercise books be? How do you know?
  • time, e.g. It takes 12 minutes to bake one batch of cookies. How long does it take to bake four batches?
  • number problems and puzzles, e.g. How many different answers can be made by using the digits 2, 3 and 4 in this calculation?
    Empty boxEmpty box × Empty box =
 

Confirming learning

Use probing questions and prompts such as:

  • Meg drew this number line. What calculation did she work out?
    A number line to illustrate how Meg worked out how many threes there are in 39. The number line starts at zero and ends at 39. There are arched lines to show that Meg multiplied three by 10 to arrive at 30, then times three by three to get from 30 to 39.
  • Show me how you would work out 15 × 4.
  • How could partitioning help you to calculate 27 × 6?
  • Give me an example of a two-digit by one-digit multiplication you could do mentally. Give me an example of a multiplication where it would help you to jot something down.