Least Common Multiple

Practice Questions

ISEE Upper Level (grades 9-12) Quantitative Reasoning › Least Common Multiple

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1

Define an operation $\bigstar$ as follows:

For all positive integers and

$a \bigstar b = \textup{lcd }(a,b) + \textup{gcf }(a,b)$ .

Evaluate $100 \bigstar 80$ .

2

Define an operation $\bigstar$ as follows:

For all positive integers and

$a \bigstar b = \textup{lcd }(a,b) + \textup{gcf }(a,b)$ .

Evaluate $100 \bigstar 80$ .

3

Which of the following is the least common multiple of and

4

Which of the following is the least common multiple of and

5

Which is the greater quantity?

(a) $50 \times 60$

(b) $LCM (50,60 ) \times GCF (50,60 )$

6

Which is the greater quantity?

(a) $50 \times 60$

(b) $LCM (50,60 ) \times GCF (50,60 )$

7

Which of the following is the least common multiple of 25 and 40?

8

What is the least common multiple of 15 and 25?

9

Which of the following is the greater quantity?

(A) The least common multiple of 25 and 30

(B) 300

10

Which of the following is the least common multiple of 25 and 40?

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