FRAME 1-33.
Solution to
COMBINED OPERATIONS. Sometimes a problem requires you to do
Frame 1-32
two or more different operations. For example: 3 x 5 + 1 requires
multiplication and addition. Is the answer 16 (15 + 1) or 18 (3 x 6)? The
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CHECK
rule is that, unless the problem indicates otherwise, you should multiply
12
12
and divide first. After these operations are completed, then you add and
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25/ 300
subtract.
25
25
300
50
50
Practice by solving these problems.
0
OR
a. 21 + 5 x 2 = __________
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b. 20 5 1 = __________
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FRAME 1-34.
Solution to
The previous frame tells you to multiply/divide, then add/subtract "unless
Frame 1-33
the problem indicates otherwise." What does this mean?
a. 31
(21 + 10)
Sometimes, you need to add or subtract first, then multiply or divide.
This is usually indicated by inclosing the operation to be done first in
b. 3
(4 1)
parentheses ( ). For example, 3 x 5 + 1 = 16 because you follow the
basic rule of multiply and divide first, but 3 x (5 +1) indicates that you are
to perform the addition function first. In this instance, the answer is 18
(3 x 6 = 18).
Practice by solving these problems.
a. (21 + 5) x 2 = __________
b. 20 (5 1) = __________
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MD0900
1-14