Find the following values without a calculator.
Give your answers in this manner. (Eg 1, 2, 3, 4)
- 100 + 60 + _____ = 165
- 4000 + _____ + 20 = 4420
- _____ + 80 + 6 = 4086
- 70000 + _____ + 8 = 72308
(a)
100 + 60 + _____ = 165
160 + _____ = 165
165 - 160 = 5
(b)
4000 + _____ + 20 = 4420
4020+ _____ = 4420
4420 - 4020 = 400
(c)
_____ + 80 + 6 = 4086
_____ + 86 = 4086
4086 - 86 = 4000
(d)
70000 + _____ + 8 = 72308
70008 + _____ = 72308
72308 - 70008 = 2300
Answer(s): 5, 400, 4000, 2300