πagarwalmath · 3rd grade · Common Core MP.1
🚀 Challenge puzzles
Make sense of problems and keep at them (puzzles that need thinking, not a known method)
Name: ______________________Date: ____________
15 friends meet. Each friend shakes hands with every other friend once. How many handshakes are there?
Answer: ______________ handshakes
23 friends meet. Each friend shakes hands with every other friend once. How many handshakes are there?
Answer: ______________ handshakes
3I think of a number. I multiply it by 2, then add 3. Now I have 7. What number did I start with?
Answer: ______________
44 friends meet. Each friend shakes hands with every other friend once. How many handshakes are there?
Answer: ______________ handshakes
5I think of a number. I multiply it by 5, then add 5. Now I have 45. What number did I start with?
Answer: ______________
6Every row, column, and diagonal makes 15. What number goes in the top middle box?
Answer: ______________
76 friends meet. Each friend shakes hands with every other friend once. How many handshakes are there?
Answer: ______________ handshakes
8Every row, column, and diagonal makes 15. What number goes in the top middle box?
Answer: ______________
9I think of a number. I multiply it by 3, then add 5. Now I have 26. What number did I start with?
Answer: ______________
10I think of a number. I multiply it by 5, then add 3. Now I have 18. What number did I start with?
Answer: ______________
11I think of a number. I multiply it by 5, then add 5. Now I have 35. What number did I start with?
Answer: ______________
12Every row, column, and diagonal makes 15. What number goes in the middle left box?
Answer: ______________
Answer key: Challenge puzzles
- 1. 10 handshakes
- 2. 3 handshakes
- 3. 2
- 4. 6 handshakes
- 5. 8
- 6. 9
- 7. 15 handshakes
- 8. 3
- 9. 7
- 10. 3
- 11. 6
- 12. 9
Practice this lesson online with games that adjust to your child: agarwalmath.com/math/3rd-grade/challenge-3