-3
1 and 2/189
Since your number line starts at 20, add 20 to your figures and you will come up with the same answer. 21 - 8 = 41 - 28 = 13
7/8 - 2/6 = 7/8 - 1/3 = 21/24 - 8/24 = 13/24
100 - 21 = 79
-3
3 x 7 = 21 29 -21 = -8
1 and 2/189
5
The inverse operation of adding 21 is subtracting 21. This means that if you subtract 21 from a number, and then add 21 to the result, you will get back to the original number.
7/8 = 21/24 7/12 = 14/24 21/24 - 14/24 = 7/24
21
How many times do you subtract 2 from 11?
Taking the time to be 8:21, and subtracting 30 minutes, gives 7:51.
16 / 8 + 2 * 5 - 21 / 7 = 2 + 10 - 3 (multiplication and division first) = 9
Since your number line starts at 20, add 20 to your figures and you will come up with the same answer. 21 - 8 = 41 - 28 = 13
21