6a add 21 = 27
It is: 86+19+21 = 126
21
The factors of 21 that add up to 8 are 1 and 7.
what two factors of -21 add up to -6
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.
111
21
21
12+9=21 21+15=36 36+13=49 49+6=55
21, 21, 21, 21 , 15, 1
Add 21 to the year: 1987 + 21 = 2008 → You turned 21 on 9th April 2008.