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Practice Test<br />
1. a) Identify a rational number between 0.5 and 0.6.<br />
b) How do you know the number you identified in part a is a rational number?<br />
2. a) Write the following rational numbers on a copy of the number line below:<br />
1 3 23 11<br />
0.6, 0.3, 2.5, 3.6, 4 , 1 ,– ,<br />
2 10 5 3<br />
–5<br />
–4<br />
–3<br />
–2<br />
–1<br />
0<br />
1<br />
2<br />
3<br />
4<br />
5<br />
b) List the numbers in part a from greatest to least.<br />
3. Evaluate.<br />
4<br />
a) 7.4 (6.1) b) a 3<br />
1<br />
c) (3.2)(0.5) d) a 3 <br />
5 10 b<br />
4 b 3<br />
4. Sarah has a balance of $2.34 in her account.<br />
Each time she makes a withdrawal, she is charged $1.20.<br />
a) <strong>What</strong> does “a balance of $2.34” mean?<br />
b) Sarah makes three more withdrawals of $20.50 each.<br />
<strong>What</strong> is her balance now?<br />
How can you use rational numbers to calculate it?<br />
c) Sarah’s overdraft limit is $500.00. How many more $20.50 withdrawals<br />
can she make? Justify your answer.<br />
5. Evaluate. How could you check your answers?<br />
a) (56.8)(14.5) b) a31 a2 3 3 b 10 b<br />
c) a42 a1 5 d) 45.8 (12.2)<br />
5 b 7 b<br />
6. a) A student evaluated the expression below and got the answer 1.<br />
<strong>What</strong> is the correct answer? How do you know?<br />
1<br />
a 1 2<br />
a3 4 b 4 b<br />
b) <strong>What</strong> might the student have done wrong to get the answer 1?<br />
7. Evaluate. Use a calculator when you need to.<br />
a) 3.1 4.5 (2.9) 7.2 (3)<br />
b) (9.7) (1.2) 5.4 2 (3.6)<br />
146 UNIT 3: <strong>Rational</strong> <strong>Number</strong>s
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