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Fourth Grade Challenging Math
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4-71)  (56 7) x 7 - 8 + (9864 - 9864) x 5 + 4

 

 

4-72) The sum of Jack and Jill's age is 48 years. Jack is twice Jill's age. How old are they?

 

 

4-73) What is the square of 11, 12, 13, 14, 15, and 16?

 

 

4-74)  Fill in the blanks with a number to make the equation work

a)  46 x ____ = 138

b)  35 x ____ = 210

c)  12 x ____ = 108

 

 

4-75) 44 people need to cross a river. They have large boats that can take 6 people each, and small boats that can take 4 people each. Find a arrangement so that there are no empty seats on the boats.  How many different arrangements can you find?
 

 

4-76) Smart multiplication

(A)  565 x 9

(B)  482 x 9


 

4-77) How many hours and minutes are there between 5:15 am and 10:23 pm in the same day?

 

 

4-78) What is the least positive number divisible by 3, 4, 5, and 6?

 

 

4-79) What is the least positive number divisible by 2, 5, and 7?

 

 

4-80) How many multiples of 13 are between1 and 100?

 

 

 

 

More math problems for fourth grade: 
1-5  6-10  11-15  16-20  21-25  26-30  31-35  36 -40  41-45  46-50  51-60  61-70

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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