Adding and Subtracting Decimal Fractions

Using what decimal operations, should you line up the decimals?

• adding and subtracting 

• multiplying and dividing

• adding and multiplying 

• subtracting and dividing

Which operations require finding a common denominator?

• multiplication 

• addition 

• addition and subtraction 

• division 

7.19 + (-5.34)

• 12.53

• -1.85

• -12.53

• 1.85

Answer explanation

To solve 7.19 + (-5.34), subtract 5.34 from 7.19. This gives 7.19 - 5.34 = 1.85. Therefore, the correct answer is 1.85.

When adding decimals with the same sign, you...

• subtract and take the sign of the larger number

• add the opposite

• add and keep the sign

• subtract and keep the sign

Answer explanation

When adding decimals with the same sign, you simply add the numbers together and keep the sign of the original numbers. This is why the correct choice is 'add and keep the sign'.

6.59 + (−7.8) − (−2.41)

• 16.8

• 11.98

• -3.62

• 1.2

Answer explanation

To solve 6.59 + (−7.8) − (−2.41), first calculate 6.59 - 7.8 = -1.21. Then, add 2.41: -1.21 + 2.41 = 1.2. Thus, the correct answer is 1.2.

Lisa had a budget of $100. She bought a shirt for $27.99 and a pair of trousers for $25.99. How much money does she have left to buy other things?

• $46.12

• $45.02

• $46.02

• $53.98

Answer explanation

Lisa spent $27.99 on a shirt and $25.99 on pants, totaling $53.98. Subtracting this from her $100 budget leaves her with $46.02, which is the correct answer.

Tony ran 7.72 kilometres. James ran 4.43 kilometres. How much farther did Tony run?

• 3.46 kilometres

• 3.29 kilometres

• 12.15 kilometres

• 11.98 kilometres

Answer explanation

To find how much farther Tony ran than James, subtract James's distance from Tony's: 4.8 miles - 2.75 miles = 2.05 miles. Therefore, the correct answer is 2.05 miles.

Jeff had $58.90 in his bank account. He withdrew $25.00. How much does he have left in his account?

• $83.90

• $32.90

• $33.90

• $84.90

Answer explanation

Jeff started with $58.90 and withdrew $25.00. To find the remaining balance, subtract the withdrawal from the initial amount: $58.90 - $25.00 = $33.90. Therefore, the correct answer is $33.90.

• 49/200

• 67/100

• 49/110

• 67/200

0.98-0.76

• 0.174

• .0022

• 2.2

• 0.22