Addition and subtraction
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Learn how to add and subtract three-digit numbers by thinking about ones, tens, and hundreds.
This course contains 4 segments:
Strategies for adding two and three-digit numbers
Learn strategies for solving addition problems within 1000.
Adding with regrouping within 1000
Learn how to add numbers like 259 + 363. These addition problems are a harder than the ones we've done before because they require regrouping (also called carrying).
Subtracting with regrouping within 1000
Learn how to subtract numbers like 363 - 259. These subtraction problems are a harder than the ones we've done before because they require regrouping (also called borrowing).
Addition and subtraction missing value problems
Learn how to solve problems like "___ - 237 = 448" where you don't know one of the values in an addition or subtraction equation.
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| Rating | Not enough ratings |
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| Length | 4 segments |
| Starts | On Demand (Start anytime) |
| Cost | Free |
| From | Khan Academy |
| Download Videos | On all desktop and mobile devices |
| Language | English |
| Subjects | Mathematics |
| Tags | Math Math: 3rd grade (U.S.) |
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| Rating | Not enough ratings |
|---|---|
| Length | 4 segments |
| Starts | On Demand (Start anytime) |
| Cost | Free |
| From | Khan Academy |
| Download Videos | On all desktop and mobile devices |
| Language | English |
| Subjects | Mathematics |
| Tags | Math Math: 3rd grade (U.S.) |
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