Grade 1 Math: Decompose Numbers
6 printable 1st Grade math worksheets on Decompose Numbers. The first three are free to download; All Access opens all 6.
Practice pages support a program; they are not the lesson. These sheets reinforce Building Number Sense Grade 1, the sequenced K–5 math series from Faith Thinkers. See every program →
Choose a worksheet below, then open the large preview to zoom.
3 of 6 free · Unlock 3 more with All Access
Teaching Decompose Numbers
What it is
These pages ask what goes with ten to make a teen number: 10 + __ = 16. The ten is already there, so the child supplies the ones.
When a child is ready
Ready once teen numbers have been built as a ten and some ones.
If they struggle
If the child adds the two numbers instead of finding the missing part, build 16 as one ten stick and loose cubes and count only the loose ones. After a few, point out that the answer is the second digit of the total, and check that shortcut against the blocks.
Worksheet preview
The whole page is fitted when opened. Use +/−, click the page, or pinch to inspect details.