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