They are 40 and 40
-21 and -3
Multiply the three-digit number by the one's digit, or last digit, of the two-digit number. That is your first part. Now multiply by the second-to-last digit, or ten's digit, and multiply the result by 10. That is your second part. Add the two parts and that is your answer.
You add two fractions with a different denominator by multiplying the denominators by a number that will make them equal. Be sure to multiply the numerator by that number too.
Multiply the two dimensions to get the area. In this case the calculation gives you 1,600 square feet.
The numbers are: 21 and -10
add the number how many times it says
Multiply two odd numbers Add an even and an odd Subtract an odd and an even