Khan Academy: Add Using Groups of 10 and 100

Challenge your third and fourth graders with a math worksheet about the multiples of 10 and 100! Youngsters solve four sections of problems, all involving multiplying and dividing by 10 and 100. Great practice before getting into larger...

Practice making groups of 10 and 100 while adding 3-digit numbers. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.

In this exercise, students practice addition using groups of 10 and 100. Students receive immediate feedback and have the opportunity to get hints, watch a video tutorial, and try questions repeatedly. CCSS.Math.Content.3.NBT.A.2...

Sal rewrites three-digit addition problems to make them easier to solve. Includes a video, transcript, and question and answer section. [3:57]

Practice adding two-digit numbers by making tens on Khan Academy. If you are stuck, watch a refresher video or choose to get a hint. Test yourself to see how many you can get correct!

Sal demonstrates the difference between subtracting 1 and subtracting 10 from 27. Includes a video, transcript, and question and answer section. [2:31]

Demonstrates how to round numbers up to four digits long to the tens and hundreds places. [6:17]

Sal shows some techniques for doing mental addition, such as making groups of 10 and 100. Includes a video, transcript, and question and answer section. [7:27]

Practice adding fractions that have denominators of 10 and 100. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.

Sal adds 1, 10, or 100 to 235. Includes a video, transcript, and question and answer section. [3:58]