This trick is a great one.
It uses an amalgamation of other mental math techniques - and will have you smashing those calculations.
Here is THE mental multiplication lesson playlist - progressing you through your mental multiplication.
• Tecmath's mental multi...
Here is that link how to multiply questions like 49 x 40 instantly
• Can you do this type o...
The rest are links where I beg for money.
To donate to the tecmath channel:paypal.me/tecmath
To support tecmath on Patreon: / tecmath
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Негізгі бет Same tens digit? Instantly multiply them
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