Arrays all around us

Equal rows

We have been learning about arrays in math. An array is a group of objects arranged in rows and columns. Each row has the same number of objects.

Arrays are useful for skip counting and solving multiplication problems. The array above has 3 rows of 4 blocks. That is 3 groups of 4, or 3 x 4. We can find out how many blocks there are by skip counting by 4’s:  4, 8, 12 – or by doing repeated addition: 4 + 4 + 4 = 12. There are 12 blocks. So, 3 x 4 = 12.

Thank you to Mr. Salsich for this post and  the idea of finding arrays all around us!!

We have found some arrays in our classroom!!


IMG00118

This picture shows 8 rows of 3

3+3+3+3+3+3+3+3=24

3,6,9,12,15,18,21,24

8×3=24

IMG00120

This picture shows 2 rows of 4

4+4=8

4,8

2×4=8

IMG00119

This picture shows 5 rows of 4

4+4+4+4+4=20

4,8,12,16,20

5×4=20

IMG00121

This picture shows 3 rows of 7

7+7+7=21

7,14,21

3×7=21

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