Add and Subtract Decimals 4

Years

Year 7

Decimals

Add and Subtract Decimals

Add and Subtract Decimals 4

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Question 1 of 5

1. Question
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$0.06 - 0.014$ $0.06-0.014$
- (0.046)
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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 $0$ $0$ .

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

$-$ $-$ $0$ $0$ $.$ $.$ $0$ $0$ $1$ $1$ $4$ $4$

Subtract as you would whole numbers

Since $0$ $0$ is less than $4$ $4$ we will use borrowing to subtract

Simply, subtract $1$ $1$ from $6$ $6$ and add $10$ $10$ to $0$ $0$ .

$5$ $5$ $10$ $10$

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

$-$ $-$ $0$ $0$ $.$ $.$ $0$ $0$ $1$ $1$ $4$ $4$

$0$ $0$ $.$ $.$ $0$ $0$ $4$ $4$ $6$ $6$

The difference is $0.046$ $0.046$

$0.046$ $0.046$
Question 2 of 5

2. Question
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$$21-85¢$
- $$$ (20.15)
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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, $85$ cents is equal to $0.85$ dollars

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

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

$2$ $1$ $.$ $0$ $0$

$-$ $0$ $.$ $8$ $5$

Subtract as you would whole numbers

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

$0$ (tenths digit) $=$ borrow $1$ from $1$

$0$ (hundredths digit) $=$ borrow $1$ from $10$ (tenths digit)

$9$

$0$ $10$ $10$

$2$ $1$ $.$ $0$ $0$

$-$ $0$ $.$ $8$ $5$

$2$ $0$ $.$ $1$ $5$

The difference is $$20.15$

$$20.15$
Question 3 of 5

3. Question
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$$16+8¢+$2.10$
- $$$ (18.18)
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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, $8$ cents is equal to $0.08$ dollars

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

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

$1$ $6$ $.$ $0$ $0$

$+$ $0$ $.$ $0$ $8$

$+$ $2$ $.$ $1$ $0$

Add as you would whole numbers

$1$ $6$ $.$ $0$ $0$

$+$ $0$ $.$ $0$ $8$

$+$ $2$ $.$ $1$ $0$

$1$ $8$ $.$ $1$ $8$

The sum is $$18.18$

$$18.18$
Question 4 of 5

4. Question
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$$15.20-35¢$
- $$$ (14.85)
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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, $35$ cents is equal to $0.35$ dollars

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

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

$1$ $5$ $.$ $2$ $0$

$-$ $0$ $.$ $3$ $5$

Subtract as you would whole numbers

Since $0$ is less than $5$ and $2$ is less than $3$ we will use borrowing to subtract

$2$ $=$ borrow $1$ from $5$

$0$ $=$ borrow $1$ from $12$

$11$

$4$ $12$ $10$

$1$ $5$ $.$ $2$ $0$

$-$ $0$ $.$ $3$ $5$

$1$ $4$ $.$ $8$ $5$

The difference is $$14.85$

$$14.85$
Question 5 of 5

5. Question
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$$3000-79¢$
- $$$ (2999.21)
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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, $79$ cents is equal to $0.79$ dollars

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

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

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

$-$ $0$ $.$ $7$ $9$

Subtract as you would whole numbers

Since $0$ is less than $9$ and $7$ we will use borrowing to subtract

$0$ (hundreds digit) $=$ borrow $1$ from $3$

$0$ (tens digit) $=$ borrow $1$ from $10$ (hundreds digit)

$0$ (units digit) $=$ borrow $1$ from $10$ (tens digit)

$0$ (tenths digit) $=$ borrow $1$ from $10$ (units digit)

$0$ (hundredths digit) $=$ borrow $1$ from $10$ (tenths digit)

$9$ $9$ $9$ $9$

$2$ $10$ $10$ $10$ $10$ $10$

$3$ $0$ $0$ $0$ $.$ $9$ $6$

$-$ $0$ $.$ $7$ $9$

$2$ $9$ $9$ $9$ $.$ $2$ $1$

The difference is $$2999.21$

$$2999.21$

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Quiz summary

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1. Question

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2. Question

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3. Question

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4. Question

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5. Question

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Quizzes

	$0$ $0$	$.$ $.$	$0$ $0$	$6$ $6$	$0$ $0$
$-$ $-$	$0$ $0$	$.$ $.$	$0$ $0$	$1$ $1$	$4$ $4$

				$5$ $5$	$10$ $10$
	$0$ $0$	$.$ $.$	$0$ $0$	$6$ $6$	$0$ $0$
$-$ $-$	$0$ $0$	$.$ $.$	$0$ $0$	$1$ $1$	$4$ $4$
	$0$ $0$	$.$ $.$	$0$ $0$	$4$ $4$	$6$ $6$

	$1$	$6$	$.$	$0$	$0$
$+$		$0$	$.$	$0$	$8$
$+$		$2$	$.$	$1$	$0$
	$1$	$8$	$.$	$1$	$8$

			$11$
	$4$		$12$	$10$
$1$	$5$	$.$	$2$	$0$
$-$	$0$	$.$	$3$	$5$
$1$	$4$	$.$	$8$	$5$

	$1$	$6$	$.$	$0$	$0$
$+$		$0$	$.$	$0$	$8$
$+$		$2$	$.$	$1$	$0$
	$1$	$8$	$.$	$1$	$8$

	$1$	$6$	$.$	$0$	$0$
$+$		$0$	$.$	$0$	$8$
$+$		$2$	$.$	$1$	$0$
	$1$	$8$	$.$	$1$	$8$