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:

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.

Try to use the best strategy you can to solve the arrays you create using this program:

**Arrays in an instant.**
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