NC.2.OA.2

• How do groups of 10 help me add?

• Why do I need to know my basic facts?

NC.2.OA.3

• What is the difference between odd numbers and even numbers?

• Explain why 13 is an odd number.

• Explain why 12 is an even number. 

NC.2.NBT.8

• Add and subtract 10 from 247. What do you notice when looking at the three numbers? What about when you add and subtract 100 from 247?

• Starting at 765, how many groups of ten will you need to add to get to 805? Starting at 329, how many groups of hundred will you need to add to get to 929?

• How does a hundred chart help you when you are adding and subtracting 10 from a number like 57?

• How does a number line help you when adding or subtracting 100 from a number like 432?

• Caroline is solving 72 + 10. She is using a hundred chart. She starts on 72 and counts 73, 74, 75, etc. until she gets to 82. Paul says there is an easier way to find the answer using the hundred chart. What do you think Paul will tell Caroline?

NC.2.NBT.5

• Is 90 a reasonable sum for 37 + 51 ? Explain

• The sum is 83, what could be the two two-digit addends? Give a different solution.

• Using one or two-digit numbers, write a subtraction equation with a difference of 42.

• Use the digits 4, 2, 0 and 7 to create two two-digit numbers with the greatest sum, the smallest difference.

• Solve 35 + 58 = with two different strategies.

• What 2-digit numbers could you add to 763 so that you would still have a sum less than 800?