GAMES
MIND MATH
Adding and Subtracting 10's

Look each equation and try to solve it in your mind. Check your answer by pressing and holding down the left button on the mouse while moving it between the stars.

40 + 50 = * 90  *
20 + 60 = *  80  *
80 + 20 = * 100 *
30 + 20 = * 50  *
10 + 70 = * 80  *
100 - 20 = * 80  *
40 - 10 = * 30  *
70 - 50 = * 20  *
80 - 30 = * 50  *
60 - 20 = * 40  *
10 + 90 = *  100 *
80 - 40 = * 40  *
30 + 50 = * 80  *
50 + 10 = * 60  *
40 + 30 = * 70  *
60 - 50 = * 10  *
20 + 50 = * 70  *
100 - 10 = * 90  *
90 - 40 = * 50  *
50 - 10 = * 40  *
50 + 20 = * 70  *
100 - 30 = * 70  *
70 - 10 = * 60  *
60 + 10 = * 70  *
30 - 20 =* 10  *

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Updated 06/12/07