Hi there!
The fastest way to multiply 2 digit numbers up tp 100 is 50.
we can directly divide 100 by 2.
a × b = ab
suppose we replace a with 50 and b with 2
50 × 2 = 100
replace 50 with a again.
a × 2 = 100
a = 100/2
a = 50
100/2 is the fastest way
Answer:
This mental multiplication trick uses the idea of a third number - a base number - to help us multiply two numbers in your head. This lesson looks at multiplying numbers near 10 using base 10. Fast Mental Multiplication Trick - Multiply in your head using base 20 and 30 How to multiply numbers near 20 and 30
Hope it helps
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