Find the following values without a calculator.
Give your answers in this manner. (Eg 1, 2, 3, 4)
- 400 + 50 + _____ = 453
- 6000 + _____ + 40 = 6740
- _____ + 80 + 5 = 6085
- 80000 + _____ + 7 = 81907
(a)
400 + 50 + _____ = 453
450 + _____ = 453
453 - 450 = 3
(b)
6000 + _____ + 40 = 6740
6040+ _____ = 6740
6740 - 6040 = 700
(c)
_____ + 80 + 5 = 6085
_____ + 85 = 6085
6085 - 85 = 6000
(d)
80000 + _____ + 7 = 81907
80007 + _____ = 81907
81907 - 80007 = 1900
Answer(s): 3, 700, 6000, 1900