Add and Subtract Decimals 3

Years

Year 8

Decimals

Add and Subtract Decimals

Add and Subtract Decimals 3

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Question 1 of 5

1. Question
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$5.27-0.6$
- (4.67)
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First, line up the decimal points (point over point).

If there are any blank values to the right of the decimal point, write $0$ .

$5$ $.$ $2$ $7$

$-$ $0$ $.$ $6$ $0$

Subtract as you would whole numbers

$5$ $.$ $2$ $7$

$-$ $0$ $.$ $6$ $0$

$.$ $7$

Since $2$ is less than $6$ we will use borrowing to subtract

Simply, subtract $1$ from $5$ and add $10$ to $2$

$4$ $12$

$5$ $.$ $2$ $7$

$-$ $0$ $.$ $6$ $0$

$4$ $.$ $6$ $7$

The difference is $4.67$

$4.67$
Question 2 of 5

2. Question
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$4.63-1.7$
- (2.93)
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First, line up the decimal points (point over point).

If there are any blank values to the right of the decimal point, write $0$ .

$4$ $.$ $6$ $3$

$-$ $1$ $.$ $7$ $0$

Subtract as you would whole numbers

$4$ $.$ $6$ $3$

$-$ $1$ $.$ $7$ $0$

$.$ $3$

Since $6$ is less than $7$ we will use borrowing to subtract

Simply, subtract $1$ from $4$ and add $10$ to $6$

$3$ $16$

$4$ $.$ $6$ $3$

$-$ $1$ $.$ $7$ $0$

$2$ $.$ $9$ $3$

The difference is $2.93$

$2.93$
Question 3 of 5

3. Question
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$37.1-5.07$
- (32.03)
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First, line up the decimal points (point over point).

If there are any blank values to the right of the decimal point, write $0$ .

$3$ $7$ $.$ $1$ $0$

$-$ $5$ $.$ $0$ $7$

Subtract as you would whole numbers

Since $0$ is less than $7$ we will use borrowing to subtract

Simply, subtract $1$ from $1$ and add $10$ to $0$

$0$ $10$

$3$ $7$ $.$ $1$ $0$

$-$ $5$ $.$ $0$ $7$

$3$ $2$ $.$ $0$ $3$

The difference is $32.03$

$32.03$
Question 4 of 5

4. Question
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$$2.96-99¢$
- $$$ (1.97)
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First, convert the cents value into dollars

To convert cents into dollars, move the decimal point $2$ places to the left

A whole number has a decimal point after its last digit

Therefore, $99$ cents is equal to $0.99$ dollars

Next, line up the decimal points (point over point).

If there are any blank values to the right of the decimal point, write $0$ .

$2$ $.$ $9$ $6$

$-$ $0$ $.$ $9$ $9$

Subtract as you would whole numbers

Since $6$ is less than $9$ we will use borrowing to subtract

$9$ $=$ borrow $1$ from $2$

$6$ $=$ borrow $1$ from $19$

$18$

$1$ $19$ $16$

$2$ $.$ $9$ $6$

$-$ $0$ $.$ $9$ $9$

$1$ $.$ $9$ $7$

The difference is $$1.97$

$$1.97$
Question 5 of 5

5. Question
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$$7+$16.40+$1.15$
- $$$ (24.55)
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First, line up the decimal points (point over point).

If there are any blank values to the right of the decimal point, write $0$ .

$7$ $.$ $0$ $0$

$+$ $1$ $6$ $.$ $4$ $0$

$+$ $1$ $.$ $1$ $5$

Add as you would whole numbers

Carry Overs $1$

$+$ $7$ $.$ $0$ $0$

$+$ $1$ $6$ $.$ $4$ $0$

$+$ $1$ $.$ $1$ $5$

$2$ $4$ $.$ $5$ $5$

The sum is $$24.55$

$$24.55$

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Quizzes

Carry Overs	$1$
$+$		$7$	$.$	$0$	$0$
$+$	$1$	$6$	$.$	$4$	$0$
$+$		$1$	$.$	$1$	$5$
	$2$	$4$	$.$	$5$	$5$