Math Tricks - Multiplications & Squares | Mental Maths | Like a human calculator :)

Math tricks to help you do multiplications and squares like a human calculator!

00:00 Intro
02:12 Two multiplication facts
06:31 Trick #1. Multiply any two 2-digit numbers 45×32
09:42 Trick #2. Square any 2-digit numbers 43^2
12:17 Trick #3. Square any 3-digit numbers 145^2
15:45 Trick #4. Tens place same, units add up to 10 68×62
17:42 Trick #5. Square 2-digit numbers ending with 5 85^2
18:57 Trick #6. Tens place same, units don't add up to 10 42×49
19:50 Trick #7. Extending to decimals 680×0.062
20:57 Practice questions
Answer to the practice questions:
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1. 63×12 = 756 (Trick #1. Multiply any two 2-digit numbers)
2. 37×33 = 1221 (Trick #4. Tens place same, units add up to 10)
3. 512^2 = 262,144 (Trick #3. Square any 3-digit numbers)
4. 4.3×0.048 = 0.2064 (Tricks #7 and 6)
5. 99^2 = 9801 (Trick #2. Square any 2-digit numbers)
6. 81×89 = 7209 (Trick #4. Tens place same, units add up to 10)
7. 75×76 = 5700 (Trick #6. Tens place same, units don't add up to 10)
8. 75^2 = 5625 (Square 2-digit numbers ending with 5)

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