Think about when we line up at school. Is it easier for the teacher to count you all in rows, or when everyone is all over the place:
When things are set up in rows and columns, they're called ARRAYS. Here's some real-life pictures of arrays:
So, here's the trick to count these rows and columns. Count the number in the first row. Count the number in the first column. Multiply those numbers together.
The student knew 4 x 5 = 20.
Then add another 4.
= 24.
= 10 + 10
= 20
Or you could have skip-counted by 5s, but that might have been slower.
3. If you have no way to break up the array using a times table you know, just skip-count to the answer.
Try to use the best strategy you can to solve the arrays you create using this program: Arrays in an instant.
No comments:
Post a Comment