The above two examples are examples of
Multiplication as repeated addition.
Let us see one more example.
Example 3 : Multiplication as repeated addition
Do you know an octopus which lives
in sea ? How many legs does it have ?
It has 8 legs. How many legs
altogether 4 octopuses have ?
The legs they have is 8 + 8 + 8 + 8.
Using our knowledge of Addition,
we can find this repeated addition as
8 + 8 + 8 + 8 = 32
or 4 times 8 is 32 or 4 x 8 = 32.
In all these three examples,
we have seen repeated addition
of a number. Instead of writing the
number and the + symbol repeatedly,
we are counting how many times the
number is added and writing it
as that count x the number.
We say that the number is
multiplied by the count
and the process is called mutiplication.
The symbol for multiplication is 'x'.
Thus, multiplication is nothing
but the repeated addition.
Exercise 1A : Multiplication as repeated addition
Fill in the blanks.
3 + 3 + 3 + 3 + 3 = --- x --- = ---
5 + 5 + 5 + 5 + 5 + 5 + 5 + 5 = --- x --- = ---
7 + 7 + 7 + 7 + 7 + 7 + 7 = --- x --- = ---
12 + 12 + 12 + 12 = --- x --- = ---
20 + 20 + 20 + 20 + 20 + 20 = --- x ---- = ---
6 x 4 is --- times --- or --- + --- + --- + --- + --- + --- = ---
3 x 8 is --- times --- or --- + --- + --- = ---
5 x 9 is --- times --- or --- + --- + --- + --- + --- = ---
2 x 30 is --- times --- or --- + --- = ---
4 x 15 is --- times --- or --- + --- + --- + --- = ---
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Answers to Exercises
Answers to Exercise 1A : Multiplication as repeated addition
5 x 3 = 15
8 x 5 = 40
7 x 7 = 49
4 x 12 = 48
6 x 20 = 120
6 times 4 or 4 + 4 + 4 + 4 + 4 + 4 = 24
3 times 8 or 8 + 8 + 8 = 24
5 times 9 or 9 + 9 + 9 + 9 + 9 = 45
2 times 30 or 30 + 30 = 60
4 times 15 or 15 + 15 + 15 + 15 = 60
Answers to Exercise 1B : Word problems in Multiplication as repeated addition