The symbol which represents addition is '$+$'  and the symbol which represents subtraction is '$-$'.

3. More than/Less than (Direct)
4. More than/Less than (Indirect)

## 1. Addition And Subtraction (Direct)

In Primary 3, we will learn about addition and subtraction of numbers up to 4-digits.

#### Question 1:

Do the following.

$1785 + 3162 =\text{__________}$

4947

#### Question 2:

Do the following.

$4360 + 4723 =\text{__________}$

9083

#### Question 3:

Do the following.

$3740 + 6231 =\text{__________}$

9971

#### Question 4:

Do the following.

The sum of 1654 and 323 is __________.

1. 1331
2. 1977
3. 1986
4. 4884

#### Solution:

Sum means ‘$+$’.

(2) 1977

#### Question 5:

Do the following.

$9017 - 901 =\text{__________}$

8116

#### Question 6:

Do the following.

$9800 - 136 =\text{__________}$

1. 9664
2. 9736
3. 9764
4. 9936

(1) 9664

#### Question 7:

Do the following.

The difference between 8080 and 606 is __________.

1. 2020
2. 7374
3. 7474
4. 8686

#### Solution:

Difference means ‘$-$’.

7474

## 2. Addition And Subtraction (Indirect)

In addition and subtraction (Indirect), we need to read the questions carefully as seeing ‘$+$’ in the questions may not necessarily mean add and ‘$-$’ in the questions may not necessarily mean subtract.

#### Question 1:

$1460 + \text{__________} = 5000$

3540

#### Question 2:

Do the following.

$2745 + \text{__________} = 3429$

684

#### Question 3:

Do the following.

$5273 + \text{__________} = 6000$

727

#### Question 4:

Do the following.

$3210 = 912 + \text{__________}$

1. 1298
2. 2298
3. 3708
4. 4122

(2) 2298

#### Question 5:

Do the following.

$7000 - \text{__________} = 2999$

4001

#### Question 6:

Do the following.

$\text{__________} - 3285 = 1076$

4361

#### Question 7:

Do the following.

$2540 - \text{__________} = 1210$

1330

#### Question 8:

Do the following.

$\text{__________} - 124 = 5240$

1. 5026
2. 5116
3. 5124
4. 5364

(4) 5364

#### Question 9:

What are the values of A and B?

1. $A = 4, B = 7$
2. $A = 3, B = 8$
3. $A = 4, B = 8$
4. $A = 3, B = 7$

#### Solution:

Starting from the ones, we add 9 and 8 to get 17.

\begin{align} A &= 8 - 4 - 1\\[2ex] &= 3\\[4ex] B &= 4 + 3 + 1\\[2ex] &= 8 \end{align}

(2) $A = 3, B = 8$

## 3. More Than/Less Than (Direct)

In more than/less than (Direct) questions, we do addition when we see the term more than and we do subtraction when we see the term less than.

#### Question 1:

1000 more than 3450 is __________.

#### Solution:

Rewriting this as an equation:

$3450 + 1000 = 4450$

4450

#### Question 2:

Do the following.

2000 more than 3465 is __________.

#### Solution:

Rewriting this as an equation:

$2000 + 3456 = \text{__________}$

5465

#### Question 3:

Do the following.

150 more than 5915 is __________.

#### Solution:

Rewriting this as an equation:

$5915 + 150 = \text{__________}$

6065

#### Question 4:

Do the following.

__________ is 1213 more than 4897.

1. 3648
2. 3684
3. 6011
4. 6110

#### Solution:

Rewriting this as an equation:

$\text{__________}= 1213 + 4897$

(4) 6110

#### Question 5:

Do the following.

100 less than 2083 is __________.

#### Solution:

Rewriting this as an equation:

$2083 - 100 =\text{__________}$

1983

#### Question 6:

Do the following.

10 less than 4753 is __________.

1. 4653
2. 4743
3. 4763
4. 4853

#### Solution:

Rewriting this as an equation:

$4753 - 10 =\text{__________}$

(2) 4743

#### Question 7:

Do the following.

__________ is 250 less than 5620.

1. 5970
2. 5870
3. 5470
4. 5370

#### Solution:

Rewriting this as an equation:

$\text{__________} = 5620 - 250$

(4) 5370

## 4. More Than / Less Than (Indirect)

In more than/less than (Indirect), we do subtraction when we see the term more than. However, we have to read the question carefully when we see the term less than.

It can be addition or subtraction, depending on how the question is phrased.

#### Question 1:

__________ more than 2000 is 6500.

#### Solution:

Rewriting this as an equation:

$2000 + \text{__________} = 6500$

$6500 - 2000 = 4500$

4500

#### Question 2:

Do the following.

__________ more than 2999 is 3455.

#### Solution:

Rewriting this as an equation:

$2999 +\text{__________}= 3455$

$3455 - 2999 = 456$

456

#### Question 3:

Do the following.

__________ more than 6835 is 8835.

1. 1000
2. 2000
3. 2600
4. 15 670

#### Solution:

Rewriting this as an equation:

$6835 + \text{__________} = 8835$

$8835 - 6835 = 2000$

(2) 2000

#### Question 4:

Do the following.

300 more than __________ is 5437.

1. 5137
2. 5237
3. 5637
4. 5737

#### Solution:

Rewriting this as an equation:

$\text{__________} + 300 = 5437$

$5437 - 300 = 5137$

(1) 5137

#### Question 5:

Do the following:

153 less than __________ is 2846.

#### Solution:

Rewriting this as an equation:

$\text{__________} - 153 = 2846$

$2846 + 153 = 2999$

2999

#### Question 6:

Do the following.

__________ less than 4657 is 4357.

#### Solution:

Rewriting this as an equation:

$4657 - \text{__________} = 4357$

$4657 - 4357 = 300$

300

#### Question 7:

Do the following.

__________ less than 7100 is 7070.

1. 30
2. 130
3. 1480
4. 14 170

#### Solution:

$7100 - \text{__________} = 7070$

$7100 - 7070 = 30$

(1) 30

#### Question 8:

What is the missing number?

5440 is __________ tens more than 4840.

1. 6
2. 60
3. 66
4. 600

#### Solution:

Rewriting this as an equation:

$5440 = 4840 + \text{__________}$

\begin{align} 5440 - 4840 &= 600\\[2ex] 600 &= 60 \text{ tens} \end{align}

(2) 60

Continue Learning
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Whole Numbers 3 Whole Numbers 6
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