Find the following values without a calculator.
Give your answers in this manner. (Eg 1
35, 3
25, 4
23, 5
67)
- 5 - 89 = _____
- 2410 - 120 = _____
- 424 - 218 = _____
- 7115 - 45 = _____
(a)
5 -
89 = 4
99 -
89 = 4
19 (b)
Make the denominators the same.
2
410 -
120 = 2
4 x 210 x 2 -
120 = 2
820 -
120 = 2
720 (c)
Make the denominators the same.
4
24 - 2
18 = 4
2 x 24 x 2 - 2
18 = 4
48 - 2
18 = 2
38 (d)
Make the denominators the same.
7
115 -
45 = 7
115 -
4 x 35 x 3 = 6
1615 -
1215 = 6
415Answer(s): 4
19, 2
720, 2
38, 6
415