Find the following values without a calculator.
Give your answers in this manner. (Eg 1, 2, 3, 4)
- 600 + 70 + _____ = 679
- 8000 + _____ + 30 = 8530
- _____ + 30 + 8 = 9038
- 60000 + _____ + 7 = 63107
(a)
600 + 70 + _____ = 679
670 + _____ = 679
679 - 670 = 9
(b)
8000 + _____ + 30 = 8530
8030+ _____ = 8530
8530 - 8030 = 500
(c)
_____ + 30 + 8 = 9038
_____ + 38 = 9038
9038 - 38 = 9000
(d)
60000 + _____ + 7 = 63107
60007 + _____ = 63107
63107 - 60007 = 3100
Answer(s): 9, 500, 9000, 3100