Multiples Math Example 1

Follow the full solution, then compare it with the other examples linked below.

easy

List the first

6

multiples of

7

, and find the

20

th multiple of

7

1
Multiples of $7$ : $7 \times 1 = 7$ , $7 \times 2 = 14$ , $7 \times 3 = 21$ , $7 \times 4 = 28$ , $7 \times 5 = 35$ , $7 \times 6 = 42$ .
2
First $6$ multiples: $7, 14, 21, 28, 35, 42$ .
3
$20$ th multiple: $7 \times 20 = 140$ .

Answer

First

6

7, 14, 21, 28, 35, 42

. The

20

th multiple is

140

Multiples of

n

are the values

n, 2n, 3n, \ldots

— the results of multiplying

n

by positive integers. The

k

th multiple is simply

kn

. There are infinitely many multiples of any non-zero integer.

About Multiples

Numbers obtained by multiplying a given number by positive integers: the skip-counting sequence $n, 2n, 3n, 4n, \ldots$

Find all multiples of [formula] between [formula] and [formula] (inclusive). How many are there?

Is [formula] a multiple of [formula]? Of [formula]? Show your reasoning.

A light flashes every [formula] seconds and a buzzer sounds every [formula] seconds. They start toge