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Multiplication & Division
Objectives
To create patterns for multiplying by two digit numbers and to devise strategies for working out multiplications using larger numbers.
Resources
Abacus 4 Textbook 3 | Squared paper
Today's Lesson
Main Activity
For the mental warm-ups for this lesson, repeat that from Lesson Four, using different fraction pairs.
Turn to page 26 in Abacus 4 textbook 3.
Look at the two grids and ask your student to think of strategies to work out which answers to the various numbers appear in the large grid at the top.
For example, any number ending in ‘0’ or ‘5’ will be divisible by 5, so 320, 170, 150 and 240 may be answers to the ‘5 times something’ from the blue square.
However, there is no point in multiplying 5 x 402, as all the possible answers (those ending in 0) in the large grid are smaller than 400. Encourage your student to discuss the factors and answers in the above way, to work out potential strategies. Each time your student comes up with a sensible strategy, ask them to go ahead with the multiplication to see if the idea was correct.
This video will talk you through some approaches you can take to solve the problem.
Once you have discussed the grids, talk about the ‘Think’ question with your student.