Learn how to multiply 2-digit numbers mentally with this step-by-step guide for kids. Discover simple techniques to boost calculation speed, improve mental math skills, and build confidence for ...

19 is only 1 away from 20, so you prefer to start by multiplying 20 times 5, which equals 100. Then we need to take away a squadron of 5, because there are actually only 19 squadrons, not 20. 100 ...

Activity: Multiplying 2-digits by 1-digit Complete this interactive activity to better understand how to multiply a 2-digit number by a 1-digit number. Then put your knowledge to the test.

In long multiplication, we have to multiply every digit of the first number by every digit of the second number. If the two numbers each have N digits, that’s N2 (or N x N) multiplications altogether.

To solve the problem, most people are taught to multiply each individual number together, and then add up the sums: 9 is multiplied by 4, 1, and 3; then 5 is multiplied by 4, 1, and 3, and so on.