Find the following values without a calculator.
Give your answers in this manner. (Eg 1, 2, 3, 4)
- 200 + 70 + _____ = 277
- 2000 + _____ + 90 = 2690
- _____ + 20 + 4 = 1024
- 70000 + _____ + 4 = 74804
(a)
200 + 70 + _____ = 277
270 + _____ = 277
277 - 270 = 7
(b)
2000 + _____ + 90 = 2690
2090+ _____ = 2690
2690 - 2090 = 600
(c)
_____ + 20 + 4 = 1024
_____ + 24 = 1024
1024 - 24 = 1000
(d)
70000 + _____ + 4 = 74804
70004 + _____ = 74804
74804 - 70004 = 4800
Answer(s): 7, 600, 1000, 4800