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Fourth Grade Challenging Math

4-61)  The area of a square is 64. What is the perimeter of the square?



4-62)  The perimeter of a square is 36. What is the area of the square?



4-63)  The area of a rectangle is 100. One side is 5. What is the perimeter of the rectangle?



4-64)  The perimeter of a rectangle is 40 inches. One side is 15 inches. What is the area of the rectangle?



4-65) A monkey ordered a pizza on Jan. 1st. On Jan. 1st he ate half of the pizza. For the next five days, each day he ate half of what was left of the pizza. How much of the pizza was left after six days?



4-66) A son is 10 years old. His dad is 3 times his age. After 10 years, what will be the ratio of the son's age to dad's age?




4-67) A son is 10 yrs old. His mother is 4 times his age. After how many years will the mother's age be twice the sons age?



4-68) There are 21 kids including Sam standing in a line. The number of kids behind Sam is 4 times the number of kids ahead of Sam. What is Sam's position in the line?



4-69) There are 4 kids in a line: Zach, Mario, Max and Ken. Max is not the first. Mario is not the last. Max is standing directly ahead of Ken. List the order from the first to the last.



4-70) What is 2 * 2 - 2 + 2 * 2 - 2 + 2?




More math problems for fourth grade: 
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71-80  81-90






Free challenging math problems for Kids (1st grade, 2nd grade, 3rd grade, 4th grade, 5th grade, 6 grade and 7th grade) 
This site contains first through seventh grade free math problems with answers that help you with math competitions. Brain teasers, hard math problems that you can practice to prepare for math contests or math competitions such as Math Olympiad Contest, Math Super Bowl and Math Counts

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