Introduction to Multiplication — Answer Key
Part A: Fill in the Blank
Write the missing word or number on each line.
1. An array with 2 rows and 5 columns shows 2 x 5.
In an array, the number of columns tells how many are in each row. 2 rows of 5 means 2 x 5.
2. 2 x 5 equals 10.
2 x 5 means 2 groups of 5, which is 5 + 5 = 10.
3. An array with 3 rows and 4 columns shows 3 x 4.
The number of rows tells how many groups. 3 rows of 4 means 3 x 4.
4. 3 x 4 equals 12.
3 x 4 means 3 groups of 4, which is 4 + 4 + 4 = 12.
5. An array with 4 rows and 2 columns has 8 items in all.
4 rows of 2 means 4 x 2 = 2 + 2 + 2 + 2 = 8.
6. An array with 5 rows and 3 columns shows 5 x 3.
The number of columns tells how many are in each row. 5 rows of 3 means 5 x 3.
7. 5 x 3 equals 15.
5 x 3 means 5 groups of 3, which is 3 + 3 + 3 + 3 + 3 = 15.
8. An array with 1 row and 6 columns has 6 items.
1 row of 6 means 1 x 6 = 6.
9. An array with 3 rows and 3 columns has 9 items in all.
3 rows of 3 means 3 x 3 = 3 + 3 + 3 = 9.
Part B: Matching
Match each item on the left to the correct answer on the right.
1. Match each item to its correct answer.
2 rows, 4 columns
→ 8
15
3 rows, 5 columns
→ 15
10
4 rows, 3 columns
→ 12
12
5 rows, 2 columns
→ 10
8
Multiply rows by columns to find the total. 2 x 4 = 8, 3 x 5 = 15, 4 x 3 = 12, 5 x 2 = 10.