Ten's Complement
Ten's Complement
Let's become number detectives! Our mission is to find the secret number pairs that team up to make our special number, 10.
Imagine we have a ten-frame, which is like a box that can hold exactly 10 counters. Right now, there are 7 counters in the box.
Imagine we have a ten-frame, which is like a box that can hold exactly 10 counters. Right now, there are 7 counters in the box.
By counting the empty spaces, we can see that we need 3 more counters to make 10.
Definition 10's Complement
The 10's complement is the number we add to make 10.
| Number | Complement | Equation | Cubes | Circles | Fingers |
| \(\textcolor{colordef}{1}\) | \(\textcolor{colorprop}{9}\) | \(\textcolor{colordef}{1}+\textcolor{colorprop}{9}=10\) |  |  |  \(+\) \(=\) |
| \(\textcolor{colordef}{2}\) | \(\textcolor{colorprop}{8}\) | \(\textcolor{colordef}{2}+\textcolor{colorprop}{8}=10\) |  |  |  \(+\) \(=\) |
| \(\textcolor{colordef}{3}\) | \(\textcolor{colorprop}{7}\) | \(\textcolor{colordef}{3}+\textcolor{colorprop}{7}=10\) |  |  |  \(+\) \(=\) |
| \(\textcolor{colordef}{4}\) | \(\textcolor{colorprop}{6}\) | \(\textcolor{colordef}{4}+\textcolor{colorprop}{6}=10\) |  |  |  \(+\) \(=\) |
| \(\textcolor{colordef}{5}\) | \(\textcolor{colorprop}{5}\) | \(\textcolor{colordef}{5}+\textcolor{colorprop}{5}=10\) |  |  |  \(+\) \(=\) |
| \(\textcolor{colordef}{6}\) | \(\textcolor{colorprop}{4}\) | \(\textcolor{colordef}{6}+\textcolor{colorprop}{4}=10\) |  |  |  \(+\) \(=\) |
| \(\textcolor{colordef}{7}\) | \(\textcolor{colorprop}{3}\) | \(\textcolor{colordef}{7}+\textcolor{colorprop}{3}=10\) |  |  |  \(+\) \(=\) |
| \(\textcolor{colordef}{8}\) | \(\textcolor{colorprop}{2}\) | \(\textcolor{colordef}{8}+\textcolor{colorprop}{2}=10\) |  |  |  \(+\) \(=\) |
| \(\textcolor{colordef}{9}\) | \(\textcolor{colorprop}{1}\) | \(\textcolor{colordef}{9}+\textcolor{colorprop}{1}=10\) |  |  |  \(+\) \(=\) |