Okay i know this is kinda a lot but i really dont understand these can someone me

when you multiply a number by a percent, you find the sum.
true
false

geoff estimates that 27% of 121 is about 30. which of the following statements is true?
his estimate is way too high.
his estimate is way too low.
his estimate is good.
there is not enough information.

which of the following is the best estimate for 77% of 60?
15
30
45
60 ; )

1.  The answer to addition problems is referred to as the sum, multiplication as the product, subtraction as the difference and division as the quotient.  So...False.
2.  You could turn the percent into a decimal, after rounding to 25, and multiply it by 121 to get about 30.  However, I find it easier to just move the decimal one place to the left and multiply the product by how many tens are in the estimated percent.
10% = .10  .10 x 121 = 12.1 x 3 = 36.3  Which is still rather close and doesn't need a calculator.
3.  Using the methods earlier, I'd say the best estimate is 45.

The answer is 41.7 because 1.39 times 30 is 41.7