Operations

Additional Practice
Section
D
Adding and Multiplying
1. Are the following statements always true? If not, show an
example for which the statement is not true.
a. A positive number multiplied by a positive number gives a
positive number.
b. A positive number added to a negative number gives a
positive number.
c. A negative number multiplied by a negative number gives a
positive number.
The students in Ms. Makuluni’s class have measured their pulse rate
for half a minute while sitting at their desks. Here are the results.
34 35 35 36 35 36
33 37 32 34 36 34
30 37 34 38 33 35
31 35 36 33 38 37
2. a. Make a list of positive and negative differences from 35.
b. Is the mean pulse rate, measured for half a minute, more or
less than 35? Show your work.
3. Complete the calculations in both tables.
Table 1 Table 2
8
5
2
1 4.5 8 5 2 1 4.5
6 6
2 3 2
2
2
6 6 30
10
10
4. Write five different calculations using positive and negative
numbers.
Fractions and decimal numbers are also allowed.
You may use addition, subtraction, and multiplication.
Don’t make your problems too hard! You must include a list with
correct answers for your calculations.
56 Operations