Place-Value Regrouping
Ten of any unit bundles into one of the next-higher place, and the reverse on the way down. Children first carry ones into tens and tens into hundreds, then extend the same rule to thousands, to multiplying by ten (which shifts every digit up one place), and finally to tenths regrouping into a whole. The single idea — units convert at a fixed exchange rate — is what every later number topic rests on.
grade 2–4 MDNBTNFOA Look for a PatternCreate a Physical Representation
Progression (7)
2-2 1. Carry ten units to the next place 4.NBT.A.24.NBT.A.1
2-2 2. Ten hundreds make one thousand 4.NBT.A.22.MD.C.8
3-1 3. Ten in a place carries forward 2.NBT.A.13.NBT.A.2
3-1 4. Ten tenths make one whole 4.NF.C.64.NF.C.5
4-1 5. Ten of a unit carries to the next place 4.NBT.A.14.NBT.A.2
4-1 6. Skip-count by the changing place value 4.NBT.A.24.OA.C.5
4-1 7. Times ten adds one place 4.NBT.A.1