Flexitable Addition & Subtraction

The orange numbers that run across the top of the grid and down the far left hand side act as the addends in addition. In subtraction they act as the subtrahends and differences.

To add 4 & 6

a) Look along the top row and find the 4.
b) Fold the table from the top to bottom, vertically, back under the numbers 1 – 4.
c) Keep the table folded and look down the left hand column for the number 6.
d) Fold the table up, horizontally, under this row.
e) In the right hand corner find the answer 10

Addition/Subtraction Grid & 18 Lesson CD