Putting It All Together: Double-Digit Addition Practice

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What are the two steps for solving $45 + 32$?

1. Add the ones: $5 + 2 = 7$. 2. Add the tens: $4 + 3 = 7$. $$\begin{array}{rr} & 45 \\ + & 32 \\ \hline & 77 \end{array}$$

$$ 22 + 34 = ? $$

$$\begin{array}{rr} & 22 \\ + & 34 \\ \hline & 56 \end{array}$$Ones: $2+4=6$ Tens: $2+3=5$

$$ 61 + 17 = ? $$

$$\begin{array}{rr} & 61 \\ + & 17 \\ \hline & 78 \end{array}$$Ones: $1+7=8$ Tens: $6+1=7$

$$ 40 + 50 = ? $$

$$\begin{array}{rr} & 40 \\ + & 50 \\ \hline & 90 \end{array}$$Ones: $0+0=0$ Tens: $4+5=9$

$$ 35 + 20 = ? $$

$$\begin{array}{rr} & 35 \\ + & 20 \\ \hline & 55 \end{array}$$Ones: $5+0=5$ Tens: $3+2=5$

$$ 83 + 14 = ? $$

$$\begin{array}{rr} & 83 \\ + & 14 \\ \hline & 97 \end{array}$$

$$ 55 + 22 = ? $$

$$\begin{array}{rr} & 55 \\ + & 22 \\ \hline & 77 \end{array}$$

$$ 16 + 81 = ? $$

$$\begin{array}{rr} & 16 \\ + & 81 \\ \hline & 97 \end{array}$$

$$ 27 + 31 = ? $$

$$\begin{array}{rr} & 27 \\ + & 31 \\ \hline & 58 \end{array}$$

$$ 92 + 3 = ? $$

$$\begin{array}{rr} & 92 \\ + & 3 \\ \hline & 95 \end{array}$$

$$ 44 + 44 = ? $$

$$\begin{array}{rr} & 44 \\ + & 44 \\ \hline & 88 \end{array}$$

$$ 65 + 34 = ? $$

$$\begin{array}{rr} & 65 \\ + & 34 \\ \hline & 99 \end{array}$$

$$ 11 + 76 = ? $$

$$\begin{array}{rr} & 11 \\ + & 76 \\ \hline & 87 \end{array}$$

$$ 50 + 29 = ? $$

$$\begin{array}{rr} & 50 \\ + & 29 \\ \hline & 79 \end{array}$$

Lila solved $21 + 33$ and got the answer $54$. Is she correct? How do you know?

Yes, she is correct. For the ones place, $1 + 3 = 4$. For the tens place, $2 + 3 = 5$. The answer is $54$. $$\begin{array}{rr} & 21 \\ + & 33 \\ \hline & 54 \end{array}$$

Sam solved $45 + 12$ and got the answer $56$. Is he correct? Why or why not?

No, he is not correct. He added the ones place wrong. $5 + 2 = 7$, so the correct answer is $57$.

$$ 73 + 21 = ? $$

$$ 94 $$

$$ 30 + 30 = ? $$

$$ 60 $$