Use the method suggested to compute mentally.
-Use breaking and bridging. $\begin{array}{r}
86 \
+\quad 69 \
\hline
\end{array}$

A) 157
B) 154
C) 155
D) 153

Question

Use the method suggested to compute mentally.
-Use breaking and bridging. $\begin{array}{r}
86 \
+\quad 69 \
\hline
\end{array}$

A) 157
B) 154
C) 155
D) 153

Quizplus · Accepted Answer

To mentally compute $86 + 69$ using breaking and bridging, first add 14 to 86 to get to 100 (since 86 + 14 = 100). Then, since we added 14 out of the 69, subtract 14 from 69 to see how much more we need to add, which is 55 (69 - 14 = 55). Finally, add this 55 to 100 to get 155.

Use the Method Suggested to Compute Mentally 86+69\begin{array}{r}86 \\+\quad 69 \\\hline\end{array}86+69​​

Use the Method Suggested to Compute Mentally $\begin{array}{r}86 \\+\quad 69 \\\hline\end{array}$