Multiplication Using The Grid Method

Objectives

To be able to multiply single digit numbers and two-digit numbers together.

To be able to apply a strategy to help to speed up mental multiplication.

Resources

Abacus 4 Textbook 1 | Squared paper | Grid Method Multiplication (YouTube)

Today's Lesson

Main Activity

Students new to this Wolsey Hall programme should learn the 5 times table throughout the course of the week, in addition to doing the other mental warm ups.

Watch Grid Method Multiplication (YouTube) to remind your student of the grid method of multiplication. (For new students, an additional example of the grid method can be seen on page 83 of this textbook.)

Think up a two-digit number to multiply by a single digit number. For example:

52 x 3 =

Explain that we can solve this using partitioning. We can split the two-digit number into tens and ones: 52 = 50 + 2


x	50	2
3

Then we can say:

50 x 3 = 150 (or 5 x 3 and multiply the answer by 10)


x	50	2
3	150

and 2 x 3 = 6


x	50	2
3	150	6

150 + 6 = 156

So, 52 x 3 = 156.

Call out a few numbers to be multiplied in this way.

Turn to page 30 in Abacus 4 Textbook 1.

Ask your student to copy and complete the calculations, using the grid method. It may not be necessary for your student to write out the whole calculation if they are able to keep the two answers in their head and to add them up mentally. However, the full mathematical sentence must always be written out, for example, 42 x 3 = 126

Ask your student to try to complete the word problems independently, as well.

Citations

[1] www.youtube.com [2] www.youtube.com