Add and Subtract Decimals 3

Years

Year 7

Decimals

Add and Subtract Decimals

Add and Subtract Decimals 3

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Question 1 of 5

1. Question
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$5.27 - 0.6$ $5.27-0.6$
- (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 $0$ $0$ .

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

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

Subtract as you would whole numbers

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

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

$.$ $.$ $7$ $7$

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

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

$4$ $4$ $12$ $12$

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

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

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

The difference is $4.67$ $4.67$

$4.67$ $4.67$
Question 2 of 5

2. Question
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$4.63 - 1.7$ $4.63-1.7$
- (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 $0$ $0$ .

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

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

Subtract as you would whole numbers

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

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

$.$ $.$ $3$ $3$

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

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

$3$ $3$ $16$ $16$

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

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

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

The difference is $2.93$ $2.93$

$2.93$ $2.93$
Question 3 of 5

3. Question
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$37.1 - 5.07$ $37.1-5.07$
- (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 $0$ $0$ .

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

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

Subtract as you would whole numbers

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

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

$0$ $0$ $10$ $10$

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

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

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

The difference is $32.03$ $32.03$

$32.03$ $32.03$
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

	$5$ $5$	$.$ $.$	$2$ $2$	$7$ $7$
$-$ $-$	$0$ $0$	$.$ $.$	$6$ $6$	$0$ $0$

	$4$ $4$		$12$ $12$
	$5$ $5$	$.$ $.$	$2$ $2$	$7$ $7$
$-$ $-$	$0$ $0$	$.$ $.$	$6$ $6$	$0$ $0$
	$4$ $4$	$.$ $.$	$6$ $6$	$7$ $7$

	$3$ $3$		$16$ $16$
	$4$ $4$	$.$ $.$	$6$ $6$	$3$ $3$
$-$ $-$	$1$ $1$	$.$ $.$	$7$ $7$	$0$ $0$
	$2$ $2$	$.$ $.$	$9$ $9$	$3$ $3$

				$0$ $0$	$10$ $10$
	$3$ $3$	$7$ $7$	$.$ $.$	$1$ $1$	$0$ $0$
$-$ $-$		$5$ $5$	$.$ $.$	$0$ $0$	$7$ $7$
	$3$ $3$	$2$ $2$	$.$ $.$	$0$ $0$	$3$ $3$

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