The problem of adding 23 and 40 is trivial. Since 2 + 4 = 6, we add the tens column and get 60; there is only 3 in the ones column so the answer is 63.
2 3 5 7 11 13 17 19 23 29 31 and 37 are the prime numbers you can use. Possible options are: 3 + 37 = 40 11 + 29 = 40 2 + 7 + 31 = 40 3 + 7 + 13 + 17 = 40 17 + 23 = 40 3 + 7 + 13 + 17 = 40
If you answered 23 correct out of 40 questions, your percent correct is 57.5%
There are two answers to that. If you get 80% of 40 and add it on, you get 72. If you get 80% as a value and add it to 40, you get 40.8
46 is between 40 and 50
the composite number is 23
If Bill says that he can add 23 and 40 without regrouping he is correct. Both numbers can easily be added in your head.
How about: 17+23 = 40 as one example
Add 40 and then take away 4.
63
23 out of 40 as a percentage = 100*23/40 = 57.5%
63
37 and 3 29 and 11 23 and 17
23+17 is 40.
23/40 as percentage = 23/40 x 100 %= 57.5%It is: 57.5%
40% = 0.40 Therefore, 40% off $23 = $23 - (0.4 x $23) = $13.80
23/40 = 0.575
23% of 40= 23% * 40= 0.23 * 40= 9.29.2 = 92/10 = 46/5 = 91/5