MULTIPLICATION

Back to: Mathematics Primary 6

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In previous classes, we learnt how to multiply a number by a 1 digit or 2-digit number. In this lesson, we will focus on multiplying a 3-digit number by a 3-digit number.

 

Example: Multiply 543 by 278

Solution: (i)

(a) 278 = 8 + 70 + 200

(b) 543 × 8 = 4344

(c) 543 × 70 = 38010

(d) 543 × 200 = 108600

 

Example 2: Multiply 827 × 107 Solution:  (i)   → 100 + 7 Multiply by 7 Multiply by 100    Answer:88489

Prod

Word Problem on Multiplication

Example 1:  24 folders each has 56 sheets of paper inside them. How many sheets of paper are there altogether?

Solution:

We can add 56 sheets 24 times

OR

Since multiplication is repeated addition, we can multiply 56 and 24 to get the answer.

1. 24 folders each has 56 sheets of paper inside them. How many sheets of paper are there altogether?

         Therefore, altogether there are 1344 sheets.

2. A carton holds 24 packets of biscuits. Each packet has 12 biscuits. How many biscuits can be packed in 45 cartons?

Solution: In one carton we can pack 24 × 12 biscuits.

In 45 cartons, we can pack 24 × 12 × 45 biscuits.

24 × 12 = 288

EVALUATION The monthly salary of a man is N2,625. What is his annual income by salary? A chair costs N452 and a table costs N1750. What will be cost of 15 chairs and 30 tables?

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