Find the missing part to make 10

Students will find the number that, when added to a given number from 1 to 9, makes a total of 10. They will use objects like ten frames to visualize and record the missing partner.

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Kindergarten · Decomposing Numbers and Making 10 · question 1 of 3

0 of 12

12 rungs. A star at the top.

3 + = 10

How it is taught

0:00 of 2:05

Ten is a whole of ten ones.

The missing part fills the ten.

Read it: 10 comes apart

8 counters sit in the frame. 2 cells sit empty. A full frame is 10, so those empty cells are the rest of the 10.

Look at the 8 counters already in the frame.
See the 2 empty cells without counting them one by one.
8 counters and 2 empty cells make 10.

Counting empty cells one by one works, but it is slow, and a skipped cell gives the wrong number.

A full frame is always 10 cells, so whatever is not filled is exactly what is still missing.

10 breaking into 8 and 2 is the same fact as 8 + 2 = 10, seen instead of recited.

10 comes apart into what is filled and what is empty; the empty cells are the rest.

Counting the 8 counters that are already there, and saying you need 8 more.

The counters you have are not the ones you still need. Look at the empty cells: 2.

5 + ___ = 10 — 5. A full frame is 10. 5 counters are in it, so 5 cells are empty.

6 + ? = 10

We need ten dots to fill our ten frame. Let's see how many more we need!

Here is a ten frame. It has ten boxes — five on top, five on the bottom.

We already have six red dots inside.

Let's count them: one, two, three, four, five, six.

How many empty boxes are left to make ten?

Let's count the empty boxes: one, two, three, four.

Four more dots fill the frame!

We can write this as six plus something equals ten.

Six plus four equals ten.

The missing part is four. Six and four make ten. Great job!

Kindergarten · Using a ten frame to find the missing partner

What you see

While they climb, your page writes one true line to ask about tonight, and a short note each Sunday.

MayaGrade 3 · Mathematics

Did you know?

A chessboard has 64 squares — share them out between the 8 rows and each row holds exactly 8.

Today’s goal: 1 star — one skill mastered, every rung of its ladder climbed
Climbing now: Divide within 100

An example student.

MayaGrade 3 · Mathematics

Maya earned 2 stars this week — Interpret multiplication as equal groups, which took 6 answers over 3 days before its star landed 3 days ago and Multiply by 6, 7, 8 and 9. Next up: Divide within 100.

An example week.

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