Step 19 Lesson 2

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Factors

Objectives

To understand the meaning of the word factor and to realise that there must be two or more factors to each divisible number.

To recognise the connection between division and multiplication.

Resources

Abacus 4 Textbook 2 | Scanner or copier

Today's Lesson

Main Activity

For the mental warm up exercises for the next three lessons, ask your student some number bond questions, both addition and subtraction.

For example:

Turn to page 45 in Abacus 4 Textbook 2.

Discuss the word ‘factor’ with your student. Explain that any number which can be multiplied by another whole number to give an answer are factors of that answer; for example, 3 and 5 are 2 of the factors of 15 because 3 x 5 = 15.

Most numbers have more than 2 factors. For example, the factors of 12 are 1, 2, 3, 4, 6 and 12, because 1 x 12 = 12, 2 x 6 = 12 and 3 x 4 = 12.

Before completing questions 1–6, watch the ‘Factors’ video to recap how to find factors and factor pairs of numbers (if required).

Before attempting the rest of the page, watch the ‘Using factors to multiply and divide’ video.

Remind your student of the examples on the video. By working out all of the factors of 20, your student can use this knowledge to complete the calculations. For example, 5 x 4 = 20, so 50 x 4 = 200 

Once your student has understood the concept, ask them to tackle the rest of the page, whilst explaining to you what they are doing.