If you can add two 3-digit numbers, then you can use the same method to add 4-digit numbers together. Just remember to add on the number that you have regrouped.

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 ...

Quiz: Subtraction with up to 4-digit numbers Complete this quiz to understand how to subtract with up to four-digit numbers. Then put your knowledge to the test.

We'll explore how this shortcut works for both two-digit numbers multiplied by themselves, and even for multiplying two different numbers ending in 5.