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In this activity, we will learn how to add two numbers using two methods.
e.g. Add the numbers below together:
22478 + 15622
Method 1:
1. Add the ten thousands, 20000 + 10000 = 30000.
2. Add the thousands, 2000 + 5000 = 7000.
3. Add the hundreds, 400 + 600 = 1000.
4. Add the tens, 70 + 20 = 90.
5. Add the ones, 8 + 2 = 10.
6. Add the total for the answer below, making sure to line up the numbers in their correct place value columns.
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+
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2
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2
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4
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7
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8
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1
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5
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6
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2
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2
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3
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0
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0
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0
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0
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|
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7
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0
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0
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0
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|
|
|
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1
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0
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0
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0
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|
|
|
|
|
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9
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0
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1
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0
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|
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3
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8
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1
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0
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0
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Method 2:
This is column addition with exchanging if a column adds to 10 or more.
1. Add the ones, 8 + 2 = 10. Write the 0 in the ones column, and exchange the 1 under the tens column.
2. Add the tens column, including the exchanged 1. Add 7 + 2 + 1 = 10. Write the 0 in the tens column and exchange the 1 under the hundreds column.
3. Add the hundreds column, including the exchanged 1. Add 4 + 6 + 1 = 11. Write the 1 in the hundreds column and exchange the 1 under the thousands column.
4. Add the thousands column, including the exchanged 1. Add 5 + 2 + 1 = 8.
5. Add the ten thousands column, 2 + 1 = 3.
So in summary:
22478 + 15622 = 38100
For the questions in this activity, you can choose which method you prefer, or have a go at using both!
