Find the following values without a calculator.
Give your answers in this manner. (Eg 1, 2, 3, 4)
- 20 - 10 = _____
- 41 - 10 = _____
- 53 - 10 = _____
- 90 - 10 = _____
(a)
20 - 10 = 10
(b)
41 - 10 = 31
(c)
53 - 10 = 43
(d)
90 - 10 = 80
Answer(s): 10, 31, 43, 80