Third Grade Challenging Math
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3-61)  One piece of lumber was cut to 5 feet long pieces. Six cuts were made. How long was the lumber?

3-62) Jane starts playing tic-tac-toe with her brother at 7:20 am. School starts at 8:25 am and it takes her 15 minutes to get to school. What is the longest amount of time she can play with her brother?

3-63) Mystic Melissa, known for her insanity, gave away 49 of her “magic” stones on the first day. On the second day she gave away 23 less than the first day. On the third day she gave away double what she gave away on the first day. And on the last day she gave away 56 more than she gave away on the third day. How many “magic” stones did she give away in all?

3-64) Kate and Aidan had 50 stickers in all on Monday. On Tuesday, Aidan gave Kate 5 stickers, so they had the same number of stickers. How many stickers did they have at the beginning?

3-65) If a store makes $700 a day, how much money does it make in 3.5 days?

3-66) What do the following letters have in common?

             E D O I C X

3-67)  Add +, -, x and/or ( ) signs to make the equations work

2   4   3   1 = 12

2   4   3   1 = 14

2   4   3   1 = 23

3-68) Smart calculations

A) 2659 + 25 - 59

B) 1349 + 220 - 349

C) 3487 + 325 - 487

3-69) A family has 3 siblings A, B and C. A has 2 brothers. B has 1 sister and 1 brother. How many brothers and sisters does C have?

3-70) List all squares of numbers from 1 to 12

More challenging math problems for third grade: 
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