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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.

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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.

Browse all Pre-K to Grade 5 standards β†’