Arithmetic Grade Two

Lesson Fourteen: Doubles in Addition and Subtraction

Doubles in Addition and Subtraction


	5 + 5 = 10	-->	10 - 5 = 5

	6 + 6 = 12	-->	12 - 6 = 6

	9 + 9 = 18	-->	18 - 9 = 9

	10 + 10 = 20	-->	20 - 10 = 10

Look at these problems carefully to see a pattern.

NOTE: Make a mixed bunch of problems involving doubles like the ones in the examples for the student to solve.