Grade 1 • Number Sense

Add within 20 by making 10 and decomposing toward 10

Fill the ten-frame first. Then add what is left.

Interaction Studio

Move counters to make 10. Then add the counters that are left.

Grade 1 Interaction Studio

Add within 20 by making 10 and decomposing toward 10

Try the controls

Make-10 model

8 plus 5 equals 13; moving 2 counters changes the make-ten decomposition, not the total.

Guided steps

Step 1 of 3
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Read the goal: Students add within 20 by making a 10 or decomposing an addend toward 10 and explain the strategy they used.

Your studio challenge

Move only enough counters to fill the ten-frame, then add the counters that are left.

Keyboard: All controls use native form elements and are reachable by Tab; arrows change range/select values; Space toggles checkboxes; Enter activates Reset. Screen reader: The engine provides an aria-live mathematical summary after every state change.

Your Turn

Make 10 first. Then add what is left.

Progress: 0 of 20 solved

Question 1 of 20

Lina has 9 stars and gets 4 more. How many of the 4 new stars should move to the 9 to make exactly 10?