Find the following values without a calculator.
Give your answers in this manner. (Eg 1, 2, 3, 4)
- 400 + 80 + _____ = 482
- 8000 + _____ + 20 = 8920
- _____ + 40 + 1 = 8041
- 50000 + _____ + 9 = 58509
(a)
400 + 80 + _____ = 482
480 + _____ = 482
482 - 480 = 2
(b)
8000 + _____ + 20 = 8920
8020+ _____ = 8920
8920 - 8020 = 900
(c)
_____ + 40 + 1 = 8041
_____ + 41 = 8041
8041 - 41 = 8000
(d)
50000 + _____ + 9 = 58509
50009 + _____ = 58509
58509 - 50009 = 8500
Answer(s): 2, 900, 8000, 8500