Teen Numbers Builder
Teen numbers like 13 are really just 10 plus 3 more. Use ten-rods and ones blocks to see why every number from 11 to 19 is made of one ten and some ones.
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Choose a level
Mode
13
Hint: 13 = 10 + ?
10
+
0 ones
0
Tap the amber squares to add or remove ones blocks, then check your answer.
Reference Guide
What Are Teen Numbers?
- Teen numbers are 11 through 19.
- Every teen number = one ten + some ones.
- Example: 14 = 10 + 4 (one ten-rod and 4 unit squares).
- Understanding this is the first step toward place value.
Place Value Preview
- The tens place tells how many groups of 10.
- The ones place tells how many leftovers.
- For 17: tens digit = 1, ones digit = 7.
- Building with blocks makes the abstract concrete.
Three Learning Modes
- Build. See the number, add ones squares to match it.
- Identify. See the blocks, type the matching number.
- Decompose. See the number, fill in the ones to complete the equation.
Standards Covered
- K.NBT.1 - Compose and decompose numbers 11 to 19.
- 1.NBT.2 - Understand that teen numbers are 10 + ones.
- Use the Learn level for introduction and guided hints.
- Use Challenge mode for timed, independent practice.
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