Properties of arithmetic operations
Answers are for parents and teachers.
1
Compute 125 · 13 · 8 in a convenient way.
13000
2
Simplify 6(x + 3y) - 2(3x - y).
20y
3
Simplify 2(5a + b) - 4(a - 3b) and find its value for a = 2, b = -1.
-2
4
A rectangle has area 840 cm² and one side 28 cm. How long is the other side (cm)?
30