Find the following values without a calculator.
Give your answers in this manner. (Eg 1, 2, 3, 4)
- 28 - 10 = _____
- 31 - 10 = _____
- 61 - 10 = _____
- 89 - 10 = _____
(a)
28 - 10 = 18
(b)
31 - 10 = 21
(c)
61 - 10 = 51
(d)
89 - 10 = 79
Answer(s): 18, 21, 51, 79