99 × 43 = ?
A4357
B4257
C4256
D4356
Answer:
B. 4257
Read Explanation:
For competitive exams, speed is crucial. When one number is close to a power of 10 (like 99 is to 100), an alternative method is much faster.
Represent 99 as (100 - 1).
The problem becomes (100 - 1) × 43.
Apply the distributive property of multiplication: (100 × 43) - (1 × 43).
Calculate 100 × 43, which is simply 4300.
Calculate 1 × 43, which is 43.
Subtract the second result from the first: 4300 - 43 = 4257.