Find the following values without a calculator.
Give your answers in this manner. (Eg 1, 2, 3, 4)
- 300 - 80 + 600 = _______
- 649 = 500 + _______ + 80
- 5628 = 5000 + _______ + 8
- 3968 = 3060 + _______
(a)
300 - 80 + 600
= 300 + 600 - 80
= 900 - 80
= 820
(b)
649 = 500 + ______ + 80
649 = 500 + 80 + ______
649 = 580 + ______
649 - 580 = 69
(c)
5628 = 5000 + ______ + 8
5628 = 5000 + 8 + ______
5628 = 5008 + ______
5628 - 5008 = 620
(d)
3968 = 3060 + ______
3968 - 3060 = 908
Answer(s): 820, 69, 620, 908