How do I decompose a number to subtract?
Suppose we want to subtract the number 35 from the number 47. To decompose these numbers, we can break them down into smaller parts that are easier to subtract:
47 = 40 + 7
35 = 30 + 5
Then, we can subtract the numbers using the decomposition:
40 – 30 = 10
7 – 5 = 2
So, the final answer is what we have left, 10 + 2 = 12.
Grade often used by:
2nd Grade | 3rd Grade
Subject:
Math | Measurement and Data | Place Value
Standards:
Common Core State Standard:
2.NBT.B.9