Find the following values without a calculator.
Give your answers in this manner. (Eg 1, 2, 3, 4)
- 600 + 60 + _____ = 664
- 4000 + _____ + 80 = 4780
- _____ + 50 + 8 = 4058
- 40000 + _____ + 9 = 48509
(a)
600 + 60 + _____ = 664
660 + _____ = 664
664 - 660 = 4
(b)
4000 + _____ + 80 = 4780
4080+ _____ = 4780
4780 - 4080 = 700
(c)
_____ + 50 + 8 = 4058
_____ + 58 = 4058
4058 - 58 = 4000
(d)
40000 + _____ + 9 = 48509
40009 + _____ = 48509
48509 - 40009 = 8500
Answer(s): 4, 700, 4000, 8500