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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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.