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
26 friends meet. Each friend shakes hands with every other friend once. How many handshakes are there?
Answer: ______________ handshakes
3Every row, column, and diagonal makes 15. What number goes in the top left box?
Answer: ______________
44 friends meet. Each friend shakes hands with every other friend once. How many handshakes are there?
Answer: ______________ handshakes
53 friends meet. Each friend shakes hands with every other friend once. How many handshakes are there?
Answer: ______________ handshakes
6I think of a number. I multiply it by 5, then add 7. Now I have 42. What number did I start with?
Answer: ______________
7I think of a number. I multiply it by 4, then add 5. Now I have 33. What number did I start with?
Answer: ______________
8I think of a number. I multiply it by 5, then add 4. Now I have 14. What number did I start with?
Answer: ______________
9Every row, column, and diagonal makes 15. What number goes in the bottom left box?
Answer: ______________
10I think of a number. I multiply it by 4, then add 6. Now I have 26. What number did I start with?
Answer: ______________
11I think of a number. I multiply it by 4, then add 8. Now I have 24. What number did I start with?
Answer: ______________
12Every row, column, and diagonal makes 15. What number goes in the bottom left box?
Answer: ______________
Answer key: Challenge puzzles
- 1. 10 handshakes
- 2. 15 handshakes
- 3. 2
- 4. 6 handshakes
- 5. 3 handshakes
- 6. 7
- 7. 7
- 8. 2
- 9. 8
- 10. 5
- 11. 4
- 12. 2
Practice this lesson online with games that adjust to your child: agarwalmath.com/math/3rd-grade/challenge-3