Page 76 - Math Genius C3

E:\Working\Orange_Education\Math_Genius_3\Open_Files\CHAP_04
\ 03-Oct-2025 Bharat Arora Proof-10 Reader’s Sign _______________________ Date __________

Step 3: Multiply the hundreds. H T O
2 hundreds × 4 = 8 hundreds 1 2
8 hundreds + 1 hundred = 9 hundreds 2 4 5

Write 9 in the hundreds column. × 4
Thus, 245 × 4 = 980 9 8 0

Example 2: Multiply 383 by 6.
Be Aware
Solution: Th H T O Practise to keep the carry over
in mind. It will help in doing the
2 4 1 calculation fast.

3 8 3
× 6
2 2 9 8 Thus, 383 × 6 = 2298

Practice Time 4C

1. Find the product of the following.

(a) H T O (b) H T O (c) Th H T O (d) Th H T O

8 8 1 6 8 6 9 4 5 3 4
× 9 × 3 × 8 × 4

2. Write in columns and find the product of the following.
(a) 83 × 8 (b) 77 × 6 (c) 305 × 2

(d) 228 × 3 (e) 326 × 5 (f) 546 × 7

Multiplication by a 2-digit nuMber

Multiplication of a 2-digit Number by a 2-digit Number

Example 1: Multiply 42 by 12.

Solution: On expanding the multiplier, we find 12 = 10 + 2 = 1 ten and 2 ones. So, we
multiply the multiplicand 42 by 2 ones and 1 ten step by step as shown below.

Step 1: Multiply 42 by 2 ones.
H T O
42 × 2 ones = 84 ones
4 2
Write 84 as the first line product. × 1 2

8 4 1st product

74 Mathematics-3