# Addition and subtraction

Contents

Fourth grade is the time to really fine-tune your addition and subtraction skills to the point that you can add and subtract pretty much any multi-digit, whole number!

## Adding multi-digit numbers

Learn to add large numbers with ease!

Intro to place value

Sal introduces place value using a toy with beads (an abacus).

Adding 3-digit numbers

Sal uses regrouping, or carrying to add 536+398.

Adding with regrouping

Sal uses regrouping to add 536+398.

Adding 3-digit numbers with regrouping

Sal uses regrouping, or carrying to add 709+996, 373+88, and 149+293.

Add within 1000

Practice adding three-digit numbers. All sums are 1000 or less.

## Subtracting: multi-digit numbers

In the 3rd grade, you learned to subtract multi-digit numbers. This includes subtraction through regrouping (sometimes known as "borrowing"). This tutorial will give you practice doing this with even larger numbers. Have fun! Common Core Standard: 4.NBT.B.4

Subtracting 3-digit numbers (regrouping) 1

Sal uses regrouping (borrowing) and place value to subtract 971-659.

Subtracting 3-digit numbers (regrouping) 2

Sal uses regrouping (borrowing) and place value to subtract 629-172.

Subtracting 3-digit numbers (regrouping twice)

Sal using regrouping (borrowing) to subtract 913-286.

Subtracting 3-digit numbers (regrouping from 0)

Sal has to borrow from a 0 to subtract 301-164.

Subtract within 1000

Subtract with 2 numbers less than 1000.