Study guide: Find Partners and Missing Parts
Find complements to ten and several decompositions of a small whole.
Ideas to explain in your own words
- A ten-frame has two rows of five spaces.
- A whole can have different pairs of parts.
- When a whole is known, the visible part can help you find a hidden part.
- The equal sign means that both sides name the same amount.
Useful vocabulary
- part
- One group within a whole.
- partner to ten
- The amount needed with another amount to make ten.
Watch your reasoning
- Count empty spaces for the missing partner, not filled spaces again.
- Do not change the whole while trying a new split.
- The hidden amount is only the missing part, not the whole group.
- Different parts can have equal totals.
A worked review example
Fill 7 spaces in a ten-frame. Three remain empty, so 7 + 3 = 10. You can see five filled spaces in the first row and two in the second. Filling the last three spaces finishes the frame without adding an eleventh space. A full ten-frame has exactly ten spaces. Count empty spaces for the missing partner, not filled spaces again. Draw two rows of five spaces, then shade the supplied number.
Make a practice plan
- Find the Missing Partner to Ten: Fill nine spaces. Expected: one more fills the frame.
- Make More Than One Split of a Whole: Show three splits of seven. Expected examples: 1+6, 2+5, and 3+4.
- Find a Hidden Part of Five: Five marks have four visible. Expected: one hidden.
- Check Whether Two Sides Name the Same Amount: Check 1+4=2+3 with drawings. Expected: both sides equal 5.