Mental Math

Time for some mental math--you should be able to do basic math in your head!

How long will it take you to add and subtract the following numbers? Your basic math facts up to 20 should be automatic. Time yourself to see how long it takes you to add and subtract facts up to 10.

Click on the math fact to reveal the answer.

Math Fact		Answer
15 + 4	=	19
7 + 6	=	13
10 - 9	=	1
20 - 7	=	13
13 + 7	=	20
18 - 3	=	15
7 - 1	=	6
11 - 3	=	8
12 + 6	=	18
11 - 1	=	10
17 - 5	=	12
16 - 6	=	10
16 + 4	=	20
16 + 2	=	18
15 - 6	=	9
12 + 3	=	15
18 - 9	=	9
2 + 17	=	19
14 - 11	=	3
2 + 3	=	5