Mangahigh
Mangahigh: Number: Add and Subtract Tens and Hundreds
Determine the sum and difference when adding and subtracting tens and hundreds.
Khan Academy
Khan Academy: Add 2 Digit Numbers by Making Tens
Students will be challenged in their skills to add 2-digit numbers by making tens
Khan Academy
Khan Academy: Adding Two Digit Numbers by Making Tens
In this exercise, students practice adding two-digit numbers by making tens. Students receive immediate feedback and have the opportunity to get hints and try questions repeatedly.
National Council of Teachers of Mathematics
Nctm: Illuminations: Grouping and Grazing
A game that reviews grouping in fives and tens, and adding and subtracting. The instuctions are clear and include a video of how to play.
CK-12 Foundation
Ck 12: Elem Math: Adding Decimals From the Thousandths Place to the Tens Place
[Free Registration/Login may be required to access all resource tools.] This mathematics resource is a video demonstrating addition with decimals to the thousandths place, followed by practice problems adding numbers with digits in the...
Khan Academy
Khan Academy: Add 2 and 3 Digit Numbers (No Regrouping)
Practice solving problems like 243 + 452. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
Khan Academy
Khan Academy: Add 1s or 10s (No Regrouping)
Practice solving problems like 34+5 and 34+50. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.