2.NBT Regrouping

Alignments to Content Standards: 2.NBT.A.1

Task

  1. What number represents the same amount as 2 tens + 7 ones?
  2. What number represents the same amount as 4 tens + 0 ones?
  3. What number represents the same amount as 5 tens + 12 ones?
  4. What number represents the same amount as 3 hundreds + 18 tens + 5 ones?
  5. What number represents the same amount as 7 hundreds + 19 tens?

IM Commentary

This task serves as a bridge between understanding place-value and using strategies based on place-value structure for addition. Place-value notation leaves a lot of information implicit. The way that the numbers are represented in this task makes this information explicit, which can help students transition to adding standard base-ten numerals.

Solution

  1. 27
  2. 40
  3. 62
  4. 485
  5. 890