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Grade 5 Math Β· World 2: Multiplication Mountain Β· Level 13
The Standard Algorithm
Connect partial products to the stacked method.
Warm-up, learn, try it together, practice, then a quick check. About 15 minutes.
What children learn in Level 13
- The standard algorithm is a shorter way to write partial products. It puts each row of the area model on one line.
- First, multiply 243 by the 6 in 36. That's 1,458. Those are the bottom row's parts, added together. When a place gets ten or more, you regroup it into the next place.
- Next, multiply by the 3 in the tens place. That 3 really means 30, so write a zero first, to hold the ones place.
- Add the two lines. It's the same answer again. You can use whichever method makes sense to you.
Georgia's K-12 Mathematics Standards:
- 5.NR.2.1 β Fluently multiply multi-digit (up to 3-digit by 2-digit) whole numbers to solve authentic problems.