Twenty-five triangle cards, six to a sheet, one for every fact family within 10 with no zeros, from 1, 1 and 2 to 5, 5 and 10. The sum sits at the top corner and the two parts at the bottom corners, with + and − between them. One child covers a corner with a thumb and the other names the hidden number: cover the sum and they add, cover a part and they subtract. The cards have no backs, so print them one-sided, and cut along the dashed line around each one.
In pairs, one child holds a triangle and covers one corner; the partner says the hidden number and the fact they used ("5 − 2 = 3"). For a whole-class warm-up, cover a corner under the document camera. Ask for all four facts of a family: 2 + 3, 3 + 2, 5 − 2 and 5 − 3.
Cover a corner and ask, then let your child cover one and ask you. Saying the four facts of a triangle out loud helps them stick.
This pack supports the following Common Core State Standards for Mathematics:
© Copyright 2010. National Governors Association Center for Best Practices and Council of Chief State School Officers. All rights reserved.
Fact family triangle cards for addition and subtraction within 10, each with a sum at the top and its two parts at the bottom. Children cover one corner and name the hidden number, adding or subtracting to find it.
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