Find the following values without a calculator.
Give your answers in this manner. (Eg 1, 2, 3, 4)
- 30 - 10 = _____
- 49 - 10 = _____
- 57 - 10 = _____
- 72 - 10 = _____
(a)
30 - 10 = 20
(b)
49 - 10 = 39
(c)
57 - 10 = 47
(d)
72 - 10 = 62
Answer(s): 20, 39, 47, 62