Find the following values without a calculator.
Give your answers in this manner. (Eg 1, 2, 3, 4)
- 700 + 20 + _____ = 721
- 4000 + _____ + 30 = 4730
- _____ + 20 + 2 = 3022
- 70000 + _____ + 1 = 71901
(a)
700 + 20 + _____ = 721
720 + _____ = 721
721 - 720 = 1
(b)
4000 + _____ + 30 = 4730
4030+ _____ = 4730
4730 - 4030 = 700
(c)
_____ + 20 + 2 = 3022
_____ + 22 = 3022
3022 - 22 = 3000
(d)
70000 + _____ + 1 = 71901
70001 + _____ = 71901
71901 - 70001 = 1900
Answer(s): 1, 700, 3000, 1900