Write the row size once for every row. That is the equation.
Step 1: Let's Learn
Read it, or press Listen and follow the words.
An example
4 rows of 3 gives 3 + 3 + 3 + 3 = 12. Four addends, all the same.
How to check it
Count the addends. There should be one for each row, and they should all match.
Writing an array as repeated addition
An array with 3 rows of 4 can be written 4 + 4 + 4 = 12 — one 4 for each row. You could also count by columns: 3 + 3 + 3 + 3 = 12. Both sentences describe the same array and both give 12.
The shorter way to write it
Writing 4 + 4 + 4 gets tedious once there are ten rows. Later you will write 3 × 4 instead, which means three groups of four. Multiplication is not a new operation to fear — it is shorthand for the repeated addition you are already doing.
Match the sentence to the picture
When you write the equation, check it against the array. Three rows of four should give three fours, not four threes — even though both total 12. Being precise now makes the difference between multiplication and division clear later.
Step 2: Try It Yourself
Tap and try it out.
3 + 3 + 3 + 3 = 12
4 rows of 3 makes 12.
Step 3: Watch an Example
One step at a time.
Watch Ana Write It Down
Ana has an array with 5 rows of 2.
- Step 1
She counts one row: 2 objects.
Step 4: Your Turn
Practice makes it stick.
The Stickers
Problem 1 of 2
A sheet has 3 rows of 5 stickers. How many addends are in its equation?
The Total
Problem 2 of 2
What is the total for 3 rows of 5?
stickers
From Array to Equation
1 of 3
4 rows of 5. What is the total?
2 of 3
2 rows of 3. How many addends in the equation?
3 of 3
5 rows of 5. What is the total?
Step 5: Quick Check
Show what you know.
Question 1 of 2
3 rows of 4. What is the total?
Question 2 of 2
In the equation for an array, how many addends are there?
What You Learned
- Write the row size once for each row.
- All the addends are the same.
- That is what makes it an equal-groups equation.