How to Use Partial Products to Multiply Two-Digit Numbers By Two-digit Numbers
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A Step-by-step Guide to Using Partial Products to Multiply Two-Digit Numbers By Two-digit Numbers
Here’s a step-by-step guide to using the Partial Products method to multiply two-digit numbers. We’ll use the problem \(24×35\) as an example.
Step 1: Break down the numbers into tens and ones
The first step is to break down both numbers into their tens and ones:
- 24 is broken down into \(20+4\)
- 35 is broken down into \(30+5\)
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Step 2: Multiply each part of the first number with each part of the second number
Now, you multiply each part of the first number with each part of the second number:
- 20 (from 24) \(\times30\) (from 35) = 600
- 20 (from 24) \(\times5\) (from 35) = 100
- 4 (from 24) \(\times30\) (from 35) = 120
- 4 (from 24) \(\times5\) (from 35) = 20
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Step 3: Add up all the products
Finally, add up all these products to get the final answer:
\(600+100+120+20=840\)
So, \(24\times35=840\)
This method is called the Partial Products method because you are finding the product of parts of the numbers (the “partial products”) and then adding them together. This method helps students understand the concept of multiplication and the importance of place value. It can be a great stepping stone before learning more traditional multiplication algorithms. For education statistics and research, visit the National Center for Education Statistics.
The Best Math Books for Elementary Students For education statistics and research, visit the National Center for Education Statistics.
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