Find the following values without a calculator.
Give your answers in this manner. (Eg 1, 2, 3, 4)
- 30 - 9 = _____
- 800 - 60 = _____
- 90 - 70 = _____
- 800 - 40 = _____
(a)
30 - 9 = 21
(b)
800 - 60 = 740
(c)
90 - 70 = 20
(d)
800 - 40 = 760
Answer(s): 21, 740, 20, 760