Find the following values without a calculator.
Give your answers in this manner. (Eg 1, 2, 3, 4)
- 600 - 40 + 800 = _______
- 715 = 500 + _______ + 40
- 4688 = 4000 + _______ + 8
- 5425 = 5020 + _______
(a)
600 - 40 + 800
= 600 + 800 - 40
= 1400 - 40
= 1360
(b)
715 = 500 + ______ + 40
715 = 500 + 40 + ______
715 = 540 + ______
715 - 540 = 175
(c)
4688 = 4000 + ______ + 8
4688 = 4000 + 8 + ______
4688 = 4008 + ______
4688 - 4008 = 680
(d)
5425 = 5020 + ______
5425 - 5020 = 405
Answer(s): 1360, 175, 680, 405