Step 1 of 4 · The trick
A missing factor? Build an array until you reach the target.
? × 4 = 20 means: how many rows of 4 do we need?
Add rows one at a time · count to 4, 8, 12, 16, 20 · that took 5 rows!
So ? = 5.
Each row is a group. Keep adding groups until you reach the total · the row count is your answer.
Step 2 of 4 · ? × 4 = 20
? × 4 = 20
4 dots per row
5 × 4 = 20
Step 3 of 4 · 6 × ? = 42
6 × ? = 42
6 dots per column
6 × 7 = 42
Step 4 of 4 · Your turn
How many groups make the total?
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Nice work!

You found the missing factors.

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