Find the following values without a calculator.
Give your answers in this manner. (Eg 1, 2, 3, 4)
- 300 + 50 + _____ = 359
- 7000 + _____ + 80 = 7680
- _____ + 40 + 9 = 9049
- 50000 + _____ + 9 = 56209
(a)
300 + 50 + _____ = 359
350 + _____ = 359
359 - 350 = 9
(b)
7000 + _____ + 80 = 7680
7080+ _____ = 7680
7680 - 7080 = 600
(c)
_____ + 40 + 9 = 9049
_____ + 49 = 9049
9049 - 49 = 9000
(d)
50000 + _____ + 9 = 56209
50009 + _____ = 56209
56209 - 50009 = 6200
Answer(s): 9, 600, 9000, 6200