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Introduction
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In this activity, we will be adding together two-digit numbers.
Two-digit numbers have a tens digit and a ones digit.
To add them together, it is useful to partition each number into its tens and ones.
Let's see how this works.
34 + 43 = ?
To add together 34 and 43, we first partition the numbers.
34 becomes 30 and 4.
43 becomes 40 and 3
Then, we add together the tens and the ones.
30 + 40 = 70
4 + 3 = 7
Lastly, we add together the two smaller totals, to make a grand total.
70 + 7 = 77
34 + 43 = 77
Let's try an example question together.
Example
Add the numbers together.
62 + 26 = ?
Answer
First, we partition the numbers.
62 becomes 60 and 2.
26 becomes 20 and 6
Now, we add together the tens and ones.
60 + 20 = 80
2 + 6 = 8
Then, we add them to find the total.
80 + 8 = 88
62 + 26 = 88
Now it's your turn to try some questions like this.
Question
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Teacher explanation