\( \definecolor{colordef}{RGB}{249,49,84} \definecolor{colorprop}{RGB}{18,102,241} \)

Subtraction Within 20

What is Subtraction?

Subtracting Numbers Within 10

Exercise
\(9-1=\)

  • \(-\) \(=\)
  • \(9-1=8\)

Exercise
\(10-2=\)

  • \(-\) \(=\)
  • \(10-2=8\)

Exercise
\(7-3=\)

  • \(-\) \(=\)
  • \(7-3=4\)

Exercise
\(9-5=\)

  • \(-\) \(=\)
  • \(9-5=4\)

Exercise
\(6-2=\)

  • \(-\) \(=\)
  • \(6-2=4\)

Exercise
\(8-3=\)

  • \(-\) \(=\)
  • \(8-3=5\)

Exercise
\(10-6=\)

  • \(-\) \(=\)
  • \(10-6=4\)

Subtracting by Taking Away Units

Exercise
\(14-1=\)
\(-\) \(=\)

  • \(-\) \(=\)
  • \(14-1=13\)

Exercise
\(15-2=\)
\(-\) \(=\)

  • \(-\) \(=\)
  • \(15-2=13\)

Exercise
\(16-1=\)
\(-\) \(=\)

  • \(-\) \(=\)
  • \(16-1=15\)

Exercise
\(16-3=\)
\(-\) \(=\)

  • \(-\) \(=\)
  • \(16-3=13\)

Exercise
\(14-4=\)
\(-\) \(=\)

  • \(-\) \(=\)
  • \(14-4=10\)

Exercise
\(17-5=\)
\(-\) \(=\)

  • \(-\) \(=\)
  • \(17-5=12\)

Subtracting by Taking Away Units and One Ten

Exercise
\(13-10=\)
\(-\) \(=\)

  • \(-\) \(=\)
  • \(13-10=3\)

Exercise
\(14-11=\)
\(-\) \(=\)

  • \(-\) \(=\)
  • \(14-11=3\)

Exercise
\(13-12=\)
\(-\) \(=\)

  • \(-\) \(=\)
  • \(13-12=1\)

Exercise
\(15-13=\)
\(-\) \(=\)

  • \(-\) \(=\)
  • \(15-13=2\)

Exercise
\(13-10=\)
\(-\) \(=\)

  • \(-\) \(=\)
  • \(13-10=3\)

Exercise
\(15-14=\)
\(-\) \(=\)

  • \(-\) \(=\)
  • \(15-14=1\)

Exercise
\(18-16=\)
\(-\) \(=\)

  • \(-\) \(=\)
  • \(18-16=2\)

Subtracting Multiple Numbers

Exercise
\(5 - 1 - 1 =\)
\(-\) \(-\) \(=\)

  • \(-\) \(-\) \(=\) \(-\)

    \(\textcolor{white}{-}\) \(\textcolor{white}{-}\) \(=\)
  • \(\begin{aligned}[t]5 - 1 - 1 &= 4 - 1\\&= 3\\\end{aligned}\)

Exercise
\(5-2-1=\)
\(-\) \(-\) \(=\)

  • \(-\) \(-\) \(=\) \(-\)

    \(\textcolor{white}{-}\) \(\textcolor{white}{-}\) \(=\)
  • \(\begin{aligned}[t]5-2-1&=3-1\\&=2\\\end{aligned}\)

Exercise
\(6 - 3 - 2 =\)
\(-\) \(-\) \(=\)

  • \(-\) \(-\) \(=\) \(-\)

    \(\textcolor{white}{-}\) \(\textcolor{white}{-}\) \(=\)
  • \(\begin{aligned}[t]6 - 3 - 2 &= 3 - 2\\&= 1\\\end{aligned}\)

Exercise
\(7 - 1 - 3 =\)
\(-\) \(-\) \(=\)

  • \(-\) \(-\) \(=\) \(-\)

    \(\textcolor{white}{-}\) \(\textcolor{white}{-}\) \(=\)
  • \(\begin{aligned}[t]7 - 1 - 3 &= 6 - 3\\&= 3\\\end{aligned}\)

Exercise
\(8 - 2 - 4 =\)
\(-\) \(-\) \(=\)

  • \(-\) \(-\) \(=\) \(-\)

    \(\textcolor{white}{-}\) \(\textcolor{white}{-}\) \(=\)
  • \(\begin{aligned}[t]8 - 2 - 4 &= 6 - 4\\&= 2\\\end{aligned}\)

Exercise
\(6 - 4 - 1 =\)
\(-\) \(-\) \(=\)

  • \(-\) \(-\) \(=\) \(-\)

    7 \(\textcolor{white}{-}\) \(\textcolor{white}{-}\) \(=\)
  • \(\begin{aligned}[t]6 - 4 - 1 &= 2 - 1\\&= 1\\\end{aligned}\)

Exercise
\(9 - 4 - 3 =\)
\(-\) \(-\) \(=\)

  • \(-\) \(-\) \(=\) \(-\)

    \(\textcolor{white}{-}\) \(\textcolor{white}{-}\) \(=\)
  • \(\begin{aligned}[t]9 - 4 - 3 &= 5 - 3\\&= 2\\\end{aligned}\)

Breaking Down Numbers

Exercise
\(3=\textcolor{colordef}{2}+\)

  • \(=\) \(+\)
  • \(3=\textcolor{colordef}{2}+\textcolor{colorprop}{1}\)

Exercise
\(5 = \textcolor{colordef}{3} +\)

  • \(=\) \(+\)
  • \(5 = \textcolor{colordef}{3} + \textcolor{colorprop}{2}\)

Exercise
\(4 = \textcolor{colordef}{1} +\)

  • \(=\) \(+\)
  • \(4 = \textcolor{colordef}{1} + \textcolor{colorprop}{3}\)

Exercise
\(7 = \textcolor{colordef}{4} +\)

  • \(=\) \(+\)
  • \(7 = \textcolor{colordef}{4} + \textcolor{colorprop}{3}\)

Exercise
\(8 = \textcolor{colordef}{3} +\)

  • \(=\) \(+\)
  • \(8 = \textcolor{colordef}{3} + \textcolor{colorprop}{5}\)

Exercise
\(9 = \textcolor{colordef}{7} +\)

  • \(=\) \(+\)
  • \(9 = \textcolor{colordef}{7} + \textcolor{colorprop}{2}\)

Exercise
\(10 = \textcolor{colordef}{6} +\)

  • \(=\) \(+\)
  • \(10 = \textcolor{colordef}{6} + \textcolor{colorprop}{4}\)

Subtracting on the Number Line

Subtracting Using the Number Line

Exercise
\(13-4=\)

  • \(13-4=9\)

Exercise
\(12-6=\)

  • \(12-6=6\)

Exercise
\(14-5=\)

  • \(14-5=9\)

Exercise
\(15-6=\)

  • \(15-6=9\)

Exercise
\(11-6=\)

  • \(11-6=5\)

Exercise
\(17-6=\)

  • \(11-6=5\)

The "Subtract to Make 10" Strategy

Breaking Down Numbers to Make Ten

Exercise
\(11-3=11-1-\)

  • \(-\) \(=\) \(-\) \(-\)

  • \(11-3=11-1-2\)

Exercise
\(12 - 3 = 12 - 2 -\)

  • \(-\) \(=\) \(-\) \(-\)

  • \(12 - 3 = 12 - 2 - 1\)

Exercise
\(14 - 6 = 14 - 4 -\)

  • \(-\) \(=\) \(-\) \(-\)

  • \(14 - 6 = 14 - 4 - 2\)

Exercise
\(12 - 7 = 12 - 2 -\)

  • \(-\) \(=\) \(-\) \(-\)

  • \(11 - 9 = 11 - 1 - 8\)

Exercise
\(11 - 9 = 11 - 1 -\)

  • \(-\) \(=\) \(-\) \(-\)

  • \(11 - 9 = 11 - 1 - 8\)

Exercise
\(13 - 7 = 13 - 3 -\)

  • \(-\) \(=\) \(-\) \(-\)

  • \(13 - 7 = 13 - 3 - 4\)

Exercise
\(15 - 9 = 15 - 5 -\)

  • \(-\) \(=\) \(-\) \(-\)

  • \(15 - 9 = 15 - 5 - 4\)

Subtracting from Ten

Exercise
\(10-3=\)

  • \(-\) \(=\)
  • \(10 - 3=7\)

Exercise
\(10-2=\)

  • \(-\) \(=\)
  • \(10 - 2=8\)

Exercise
\(10-4=\)

  • \(-\) \(=\)
  • \(10 - 4=6\)

Exercise
\(10-1=\)

  • \(-\) \(=\)
  • \(10 - 1=9\)

Exercise
\(10-5=\)

  • \(-\) \(=\)
  • \(10 - 5=5\)

Exercise
\(10-7=\)

  • \(-\) \(=\)
  • \(10 - 7=3\)

Exercise
\(10-6=\)

  • \(-\) \(=\)
  • \(10 - 6=4\)

Making 10 after Breaking Down Numbers

Exercise
\(13-5\) \(=\) \(13-3-2\)
\(=\)

  • \(-\) \(=\) \(-\) \(-\)

    \(\textcolor{white}{-}\) \(=\) \(-\)

    \(\textcolor{white}{-}\) \(=\)
  • \(\begin{aligned}[t]13 - 5&=13 - 3 - 2\\&=10 - 2\\&=8\\\end{aligned}\)

Exercise
\(17-8\) \(=\) \(17-7-1\)
\(=\)

  • \(-\) \(=\) \(-\) \(-\)

    \(\textcolor{white}{-}\) \(=\) \(-\)

    \(\textcolor{white}{-}\) \(=\)
  • \(\begin{aligned}[t]17 - 8 &= 17 - 7 - 1\\&=10 - 1\\&=9\\\end{aligned}\)

Exercise
\(16-8\) \(=\) \(16-6-2\)
\(=\)

  • \(-\) \(=\) \(-\) \(-\)

    \(\textcolor{white}{-}\) \(=\) \(-\)

    \(\textcolor{white}{-}\) \(=\)
  • \(\begin{aligned}[t]16 - 8 &= 16 - 6 - 2\\&=10 - 2\\&=8\\\end{aligned}\)

Exercise
\(15-8\) \(=\) \(15-5-3\)
\(=\)

  • \(-\) \(=\) \(-\) \(-\)

    \(\textcolor{white}{-}\) \(=\) \(-\)

    \(\textcolor{white}{-}\) \(=\)
  • \(\begin{aligned}[t]15 - 8 &= 15 - 5 - 3\\&=10 - 3\\&=7\\\end{aligned}\)

Exercise
\(14-7\) \(=\) \(14-4-3\)
\(=\)

  • \(-\) \(=\) \(-\) \(-\)

    \(\textcolor{white}{-}\) \(=\) \(-\)

    \(\textcolor{white}{-}\) \(=\)
  • \(\begin{aligned}[t]14 - 7 &= 14 - 4 - 3\\&=10 - 3\\&=7\\\end{aligned}\)

Exercise
\(18-9\) \(=\) \(18-8-1\)
\(=\)

  • \(-\) \(=\) \(-\) \(-\)

    \(\textcolor{white}{-}\) \(=\) \(-\)

    \(\textcolor{white}{-}\) \(=\)
  • \(\begin{aligned}[t]18 - 9 &= 18 - 8 - 1\\&=10 - 1\\&=9\\\end{aligned}\)

Exercise
\(13-7\) \(=\) \(13-3-4\)
\(=\)

  • \(-\) \(=\) \(-\) \(-\)

    \(\textcolor{white}{-}\) \(=\) \(-\)

    \(\textcolor{white}{-}\) \(=\)
  • \(\begin{aligned}[t]13 - 7 &= 13 - 3 - 4\\&=10 - 4\\&=6\\\end{aligned}\)

Exercise
\(13-9\) \(=\) \(13-3-6\)
\(=\)

  • \(-\) \(=\) \(-\) \(-\)

    \(\textcolor{white}{-}\) \(=\) \(-\)

    \(\textcolor{white}{-}\) \(=\)
  • \(\begin{aligned}[t]13 - 9 &= 13 - 3 - 6\\&=10 - 6\\&=4\\\end{aligned}\)

Subtracting Number Within 20

Exercise
\(13-5=\)

  • \(-\) \(=\) \(-\) \(-\)

    \(\textcolor{white}{-}\) \(=\) \(-\)

    \(\textcolor{white}{-}\) \(=\)
  • \(\begin{aligned}[t]13 - 5&=13 - 3 - 2\\&=10 - 2\\&=8\\\end{aligned}\)

Exercise
\(17-8=\)

  • \(-\) \(=\) \(-\) \(-\)

    \(\textcolor{white}{-}\) \(=\) \(-\)

    \(\textcolor{white}{-}\) \(=\)
  • \(\begin{aligned}[t]17 - 8 &= 17 - 7 - 1\\&=10 - 1\\&=9\\\end{aligned}\)

Exercise
\(16-8=\)

  • \(-\) \(=\) \(-\) \(-\)

    \(\textcolor{white}{-}\) \(=\) \(-\)

    \(\textcolor{white}{-}\) \(=\)
  • \(\begin{aligned}[t]16 - 8 &= 16 - 6 - 2\\&=10 - 2\\&=8\\\end{aligned}\)

Exercise
\(15-8=\)

  • \(-\) \(=\) \(-\) \(-\)

    \(\textcolor{white}{-}\) \(=\) \(-\)

    \(\textcolor{white}{-}\) \(=\)
  • \(\begin{aligned}[t]15 - 8 &= 15 - 5 - 3\\&=10 - 3\\&=7\\\end{aligned}\)

Exercise
\(14-7=\)

  • \(-\) \(=\) \(-\) \(-\)

    \(\textcolor{white}{-}\) \(=\) \(-\)

    \(\textcolor{white}{-}\) \(=\)
  • \(\begin{aligned}[t]14 - 7 &= 14 - 4 - 3\\&=10 - 3\\&=7\\\end{aligned}\)

Exercise
\(18-9=\)

  • \(-\) \(=\) \(-\) \(-\)

    \(\textcolor{white}{-}\) \(=\) \(-\)

    \(\textcolor{white}{-}\) \(=\)
  • \(\begin{aligned}[t]18 - 9 &= 18 - 8 - 1\\&=10 - 1\\&=9\\\end{aligned}\)

Exercise
\(13-7=\)

  • \(-\) \(=\) \(-\) \(-\)

    \(\textcolor{white}{-}\) \(=\) \(-\)

    \(\textcolor{white}{-}\) \(=\)
  • \(\begin{aligned}[t]13 - 7 &= 13 - 3 - 4\\&=10 - 4\\&=6\\\end{aligned}\)

Exercise
\(13-9=\)

  • \(-\) \(=\) \(-\) \(-\)

    \(\textcolor{white}{-}\) \(=\) \(-\)

    \(\textcolor{white}{-}\) \(=\)
  • \(\begin{aligned}[t]13 - 9 &= 13 - 3 - 6\\&=10 - 6\\&=4\\\end{aligned}\)