This is the first video lesson of Pre-Algebra by Khan Academy
Exercises for this lesson:
1 - 5 x 6 =
2 - 5 - 9 =
4 ÷ 2 - 3 =
4 - 9 + 4 =
3 + 10 x 9 =
9 - 5 - 2 =
8 + 1 x 9 =
10 - 5 + 9 =
5 + 9 + 9 =
6 + 3 ÷ 1 =
5 ÷ 5 x 1 =
1 - 2 + 4 =
6 x 7 x 10 =
7 x 10 + 4 =
8 x 8 x 9 =
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