## Multiplication X

### Posted by saratat | Posted in Uncategorized | Posted on November 11, 2016

1/2ST are revisiting the topic of multiplication. The symbol for multiplication is X

Other words for multiplication are:

• multiplied by eg .2 multiplied by3
• times eg. 2 times 3
• the product of ___ and ____ eg. the product of 2 and 3 is 6
• by eg. 2 by 3 is 6
• rows of eg.2 rows of 3

We are working in ‘just right’ Maths groups to develop our skills in understanding what multiplication looks like and different strategies to solve the problems.

To show visually what multiplication looks like we can make arrays. Arrays are neatly arranged rows that have the same amount in each row. Here is an example of an array in the real world. It is a carton of eggs.

There are 2 rows (horizontal lines) with 3 eggs in each row.

This can be written as, 2 rows of 3 or 2 X 3

Once students can identify how many rows there are and how many are within each row, they can use one of the two numbers identified to skip count to the answer.

The answer can be found by skip counting by 2s ie. 2, 4, 6! Or is can be found by skip counting by 3s ie 3, 6!

Therefore, the answer to 2 rows of 3 or 2 X 3 is 6!

Can you find any arrays around your house or yard? How would you write them as a multiplication problems?

Once students have mastered this understanding they are working towards identifying and writing multiplication problems from worded stories eg. How many wheels are there altogether if there are 5 cars? Ie. 4 wheels X 5 cars = _____  OR  4 X 5 = _____

Some students are also building their speed and accuracy with known facts. This means that they are aiming to quickly answer their 10 times tables, 2 times tables, 5 times tables, and 3 times tables within 1 to 2 seconds. If they master these, they can move on to their 4 times tables.

Here is a great video from the Khan Academy that explains what multiplication is: Khan Academy YouTube Clip

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