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• Pre algebra
• Decimal numbers
• Adding and subtracting decimals

# Adding and subtracting decimals

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•  Question 1: 1 pts Evaluate: $$\begin{array}{r cccc} & 9 & 0 \\ + & 8 & 3. & 0 \\ \hline \end{array}$$
 $172.0$ $172.9$ $173.1$ $173.0$
•  Question 2: 1 pts Evaluate:$$\begin{array}{r cccc} & 9 & 8.& 0 \\ - & 6 & 9. & 9 \\ \hline \end{array}$$
 $28.9$ $28.1$ $29.1$ $29.8$
•  Question 3: 1 pts Evaluate expression:$$3.4-(-12.1)$$
 $15.0$ $16.0$ $15.5$ $16.5$
•  Question 4: 1 pts In the given scheme, the number in each rectangle is equal to the sum of the numbers in the circles on either side.
 $? = 7.15$ $? = 1.54$ $? = 13.26$ $? = 14.26$
•  Question 5: 2 pts Peter had $\$2.30.$He spent$ \$0.75$ on a notebook. How much money did he have left? Use the picture.
 $\$1.50 \$1.55$ $\$1.60 \$1.65$
•  Question 6: 2 pts Is the following expression true or false? $$-13.6+2+15.5=4.9$$
•  Question 7: 2 pts A new exercise book costs $62$ cents a ruler costs $37$ cents and a calculator costs $\unicode{0x20AC} \, 4.02$ . How much will the three items cost altogether?
 $\unicode{0x20AC} \, 5.01$ $\unicode{0x20AC} \, 5.02$ $\unicode{0x20AC} \, 5.03$ $\unicode{0x20AC} \, 5.04$
•  Question 8: 2 pts Chloe wants to buy $3\dfrac{3}{4}$ metres of red fabric. The shopkeeper says he has only $1.90m$ left. How much short is this of what Chloe wants?
 $1.65m$ $1.75m$ $1.85m$ $1.95m$
•  Question 9: 2 pts Is the following expression true or falce? $$\begin{array}{r cccc} & 1 & 9.& 2 & 8 \\ - & & 0.& 4 & 5 \\ \hline & 1 & 8.& 8 & 3 \end{array}$$
•  Question 10: 3 pts Robbie buys a loaf of bread costing $\unicode{0x20AC} \, 1.12$. some apples costing $\unicode{0x20AC} \, 1.75$. and some cheese costing $66$ cents . He hands the shopkeeper a $\unicode{0x20AC} \, 5$ note and receives $\unicode{0x20AC} \, 1.47$ in change. Is this the correct change?
•  Question 11: 3 pts Suzi is $0.19$ meter shorter than Lina. Kelly is $0.21$ meter taller than Suzi. Lina is $1.68$ meter tall. What is Kellys height?
 $1.85m$ $1.80m$ $1.75m$ $1.70m$
•  Question 12: 3 pts In the given scheme. the number in each square is equal to the sum of the numbers in the circles on either side. Which of the following expression can be used to find unknown numbers?
 $A=10.12-4.7 , B=A-8.6 , C=B-4.7$ $A=10.12+4.7 , B=A-8.6 , C=4.7+B$ $A=10.12-4.7 , B=A-8.6 , C=4.7+B$ $A=10.12-4.7 , B=8.6-A , C=4.7+B$