2-min Fluency Warm-up — Doubles! Solve in your head.
3 + 3 =
5 + 5 =
4 + 4 =
7 + 7 =
Three easy rules:
• Any number × 0 = 0 (zero groups = nothing!)
• Any number × 1 = itself (one group)
• Any number × 2 = the double (two groups)
6 × 0 =
4 × 1 =
3 × 2 =
9 × 0 =
7 × 1 =
6 × 2 =
Fill in the missing 2s facts. Hint: double it!
Number Talk — Explain WITHOUT calculating.
Maya says 100 × 0 is a really big number because 100 is big.
Is she right? Why or why not?
My thinking:
Which is bigger: 8 × 1 or 8 × 0?
How do you know without solving?
My thinking:
Challenge
I am a number. When you multiply me by 1, I stay the same. When you multiply me by 2, I become 14. What number am I?
Write your OWN riddle like this for a family member to solve: