Find the following values without a calculator.
Give your answers in this manner. (Eg 1, 2, 3, 4)
- 800 - 70 + 600 = _______
- 818 = 500 + _______ + 60
- 8524 = 8000 + _______ + 4
- 3427 = 3020 + _______
(a)
800 - 70 + 600
= 800 + 600 - 70
= 1400 - 70
= 1330
(b)
818 = 500 + ______ + 60
818 = 500 + 60 + ______
818 = 560 + ______
818 - 560 = 258
(c)
8524 = 8000 + ______ + 4
8524 = 8000 + 4 + ______
8524 = 8004 + ______
8524 - 8004 = 520
(d)
3427 = 3020 + ______
3427 - 3020 = 407
Answer(s): 1330, 258, 520, 407