Why do you sometimes need to regroup in 3 digit addition problems

4 fair coins are tossed. What is the probability that all the outcomes are heads?

15 3/14 + 24 1/14 + 12 2/7 + 12 2/7 + 10 1/7 + 10 1/7 + 35 3/7=

A spinner has four unequal parts. Tony spun the spinner 16 times. The spinner landed on red 1 time, blue 2 times, yellow 3 times and green 10 times. Using this data, what is the most likely outcome on the next spin? red blue green yellow

Sonya is 22 years younger than he mother. The average of their ages is 16

Mr. Hanson wants to have enough pencils for each student to have 36 pencils at the beginning of the year, a pencil for each week of the school year. If Mr. Hanson has 32 students on his roll this year, How many pencils does he need to purchase?

Two numbers differ by 30. If 15 is added to the smaller, the result exceeds half the larger number by 7 1/2. What are the numbers

Is the graph of 6x2 - 2y = 7 a line? Explain.

Factors of 48 that add to equal 26

Jill starts to make a cake using the ratio 3:4. She measure her cake mix and only has 2 cups. How much water will she need to add in order to keep the ratio the same?

Calculate the interest earned in 8 months, at 3.9%, if you deposit $1,200 in a bank account.