## Topic Recap:

### Addition within 100 without renaming

Example:

Jerry went to an arcade. He won 38 tickets from his first game and 21 tickets from his second game. How many tickets did he win altogether from the 2 games?

Solution:

$38 + 21 = 59$

$\begin{matrix} & 3 & 8\\ + & 2 & 1\\ \hline & 5 & 9\\ \hline \end{matrix}$

59 tickets

Question 1:

1. 25
2. 26
3. 73
4. 75

Solution:

$50 + 25 = 75$

$\begin{matrix} & 5 & 0\\ + & 2 & 5\\ \hline & 7 & 5\\ \hline \end{matrix}$

(4) 75

Example:

There are 453 boys and 216 girls in a school. How many boys and girls are there in the school altogether?

Solution:

$453 + 216 = 669$

$\begin{matrix} & 4 & 5 & 3\\ + & 2 & 1 & 6\\ \hline & 6 & 6 & 9\\ \hline \end{matrix}$

669 boys and girls.

Question 1:

1. 254
2. 608
3. 658
4. 659

Solution:

$402 + 256 = 658$

$\begin{matrix} & 4 & 0 & 2\\ + & 2 & 5 & 6\\ \hline & 6 & 5 & 8\\ \hline \end{matrix}$

(3) 658

Question 2:

1. 767
2. 777
3. 778
4. 779

Solution:

$654 + 123 = 777$

$\begin{matrix} & 6 & 5 & 4\\ + & 1 & 2 & 3\\ \hline & 7 & 7 & 7\\ \hline \end{matrix}$

(2) 777

## Topic Recap:

### Addition within 100 with renaming

Example:

Kenny collects stamps. He has 67 foreign stamps and 28 local stamps. How many stamps does he have altogether?

Solution:

$67 + 28 = 95$

$\begin{matrix} & \overset{1}{6} & 7 \\ + & 2 & 8 \\ \hline & 9 & 5 \\ \hline \end{matrix}$

95 stamps

Question 1:

1. 73
2. 74
3. 83
4. 84

Solution:

$39 + 45 = 84$

$\begin{matrix} & \overset{1}{3} & 9 \\ + & 4 & 5 \\ \hline & 8 & 4 \\ \hline \end{matrix}$

(4) 84

Example:

There are 378 adults and 414 children in the estate. How many people are there in the estate altogether?

Solution:

$378 + 414 = 792$

$\begin{matrix} & 3 & \overset{1}{7} & 8\\ + & 4 & 1 & 4\\ \hline & 7 & 9 & 2\\ \hline \end{matrix}$

792 people

Question 1:

1. 703
2. 803
3. 813
4. 913

Solution:

$316 + 497 = 813$

$\begin{matrix} & \overset{1}{3} & \overset{1}{1} & 6\\ + & 4 & 9 & 7\\ \hline & 8 & 1 & 3\\ \hline \end{matrix}$

(3) 813

Question 2:

The sum of 237 and 508 is __________.

1. 733
2. 735
3. 743
4. 745

Solution:

$237 + 508 = 745$

$\begin{matrix} & 2 & \overset{1}{3} & 7\\ + & 5 & 0 & 8\\ \hline & 7 & 4 & 5\\ \hline \end{matrix}$

(4) 745

Question 3:

Use the numbers below to form an addition sentence. You can use numbers more than once.

$\bbox[border:1px solid #27aae1] { \bbox[#27aae1,15px,border:2px solid white] { \color{white}{\text{245} \qquad\qquad \text{115} \qquad\qquad \text{180} \qquad\qquad \text{65}} } }$

Solution:

$\begin{matrix} & 1 & \overset{1}{1} & 5\\ + & & 6 & 5\\ \hline & 1 & 8 & 0\\ \hline \end{matrix}$

$115 + 65 = 180$

Question 4:

$280 + 120 =$ __________ tens

1. 30
2. 40
3. 300
4. 400

Solution:

$280 + 120 = 400$

$\begin{matrix} & \overset{1}{2} & 8 & 0\\ + & 1 & 2 & 0\\ \hline & 4 & 0 & 0\\ \hline \end{matrix}$

$400 = 40$ tens

(2) 40

Question 5:

$278 + 222 =$ __________ hundreds

1. 5
2. 40
3. 50
4. 4

Solution:

$278 + 222 = 500$

$\begin{matrix} & \overset{1}{2} & \overset{1}{7} & 8\\ + & 2 & 2 & 2\\ \hline & 5 & 0 & 0\\ \hline \end{matrix}$

$500 = 5$ hundreds.

(1) 5

Question 6:

Fill in the blank with the correct answer:
$\bbox[border:1px solid #27aae1] { \bbox[#27aae1,15px,border:2px solid white] { \color{white}{\text{23 tens 2 ones + 6 hundreds 15 ones = __________}} } }$

1. 46
2. 232
3. 837
4. 847

Solution:

23 tens 2 ones

\begin{align} &= 230 + 2 \\[2ex] &= 232 \end{align}

6 hundreds 15 ones

\begin{align} &= 600 + 15 \\[2ex] &= 615 \end{align}

Therefore,

$232 + 615 = 847$

$\begin{matrix} & 2 & 3 & 2\\ + & 6 & 1 & 5\\ \hline & 8 & 4 & 7\\ \hline \end{matrix}$

(4) 847

Question 7:

Fill in the blanks with the correct answer:
$\bbox[border:1px solid #27aae1] { \bbox[#27aae1,15px,border:2px solid white] { \color{white}{\text{39 tens 18 ones + 27 tens 31 ones = __________ tens 9 ones}} } }$

1. 7
2. 70
3. 700
4. 709

Solution:

39 tens 18 ones

\begin{align}​​ &= 390 + 18\\[2ex] &= 408 \end{align}

27 tens 31 ones

\begin{align}​​ &= 270 + 31\\[2ex] &= 301 \end{align}

Therefore,

$408+301=709$

$\begin{matrix} & 4 & 0 & 8\\ + & 3 & 0 & 1\\ \hline & 7 & 0 & 9\\ \hline \end{matrix}$

(4) 709

Question 8:

What is the missing digit in the box?

$\begin{matrix} & 6 & 5 & 6\\ + & 2 & ^\bbox[8px,border:2px solid red]{} & 8\\ \hline & 9 & 5 & 4\\ \hline \end{matrix}$

1. 0
2. 8
3. 9
4. 4

Solution:

$\begin{matrix} & 6 & \overset{1}{5} & 6\\ + & 2 & \bbox[8px,border:2px solid red]{9} & 8\\ \hline & 9 & 5 & 4\\ \hline \end{matrix}$

(3) 9

Question 9:

Kate added two of the numbers below and got the answer 108. Which two numbers did she add?

1. A and C
2. A and B
3. B and C
4. B and D

Solution:

Let’s calculate the options.

1. $69 + 49 = 118$
2. $69 + 59 = 128$
3. $59 + 49 = 108$
4. $59 + 19 = 78$

(3) B and C

## Conclusion

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Numbers To 1000 Multiplication And Division 1
Multiplication And Division 2 Addition And Subtraction 1
Addition And Subtraction 2 Fractions 1
Length 1 Mass 1
Volume 1 Money 1
Time 1 Shapes And Patterns
Picture Graphs 1 Model Drawing 1
Model Drawing 4
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