Page 47 - Math 4

Fundamental Operations Fundamental Operations

3.8 Multiplication of bigger numbers

Let's investigate the idea of multiplication of bigger numbers from these
illustrations.
Example 1. Multiply 32 by 4.

3 2 30 + 2
× 4 × 4 × 4 = =
128 120 + 8
3 tens + 2 ones 10 tens = 1 hundred + 2 tens + 8 ones 100 + 20 + 8

Example 2. Multiply 256 by 7.

256
200 + 50 + 6 3 4
× 7
× 7 2 5 6
42
1400 + 350 + 42 × 7
350
= 1792 1792
+1400
1792
Example 3. Multiply 3475 by 25. Example 4. Multiply 4897 by 364.

3 4 7 5 4 8 9 7
× 2 5 20 + 5 × 3 6 4 300 + 60 + 4
17375 5 × 3475 19588 4 × 4897
+69500 20 × 3475 293820 60 × 4897
1469100
86875 + 300 × 4897
1782508
Exercise - 3.2
Section A - Classwork

1. Let's tell and write the multiplier and multiplicand. Then find the
product.

a) b) c)

× = × = × =
2. Let's draw as many dots as to match the given sums. Then tell and
write the product as quickly as possible.

a) 5 × 3 = = dots

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vedanta Excel in Mathematics - Book 4
Approved by Curriculum Development Centre, Sanothimi, Bhaktapur v edanta Ex c e l in Mathematics - Book 4