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Addition - using Partial Sums Method




 
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More Lessons for Grade 2

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Videos, stories and songs to help Grade 2 students learn how to add using the partial sums method and how to subtract using the trade-first subtraction method.

How to add using the partial sums method?
1. Starting from the left, add up the numbers in the hundreds place.
2. Add up the numbers in the tens place.
3. Add up the numbers in the ones place.
4. Add up all the partial sums.

How to subtract using Trade-First Subtraction Algorithm?
1. Look at the digit in the 1s place. If subtracting these digits results in a negative number then trade 1 ten for 10 ones.
2. Do the same for the 10s place, 100s place and so on.
3. Subtract in each column.

3 digits + 3 digits using the partial sums addition method
4 digits + 3 digits using the partial sums method



Trade-First Subtraction Algorithm
Trade-First Subtraction Algorithm


 

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