Count arrays with repeated addition
The idea
Check that every row has the same number of objects.
Step by step
- Check that every row has the same number of objects.
- Write an addition expression with one equal addend for each row.
- Find the total and count by columns to check it another way.
Example
An array has 2 equal rows of 3 dots. How many dots are there altogether?
Answer
6
Add one count for each row: 3 + 3 = 6.
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Build an array with counters. Write one repeated-addition expression for rows and another for columns.
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