3rd Grade Multiplication Help for Struggling Students
In 3rd grade, you'll take a big step in your understanding of number operations because you'll learn to multiply 1digit numbers by 2digit numbers, like 3 x 70. Keep reading for help with this skill!
Help with 3rd Grade Multiplication
There are several different methods for multiplying 2digit numbers by 1digit numbers. If you can master more than one, you'll have a deeper understanding of multiplication.
Standard Algorithm
This is the way that most students learn to multiply with multidigit numbers. Write the larger number on top with the singledigit number directly below its ones place. For example, if you're multiplying 30 by five (30 x 5), you would write the five underneath the zero. Then, draw a horizontal line below the five.
The next step is to multiply the bottom number (five) by the number directly above it (zero), and write the answer (zero) beneath these two numbers under the horizontal line. Last, multiply the bottom number (five) by the number in the tens place (three), and write this answer (15) to the left of the number that's already below the horizontal line (zero). The new number under the horizontal line (150) is the correct answer (30 x 5 = 150).
Expanded Form
Another way to solve multiplication problems with 1 and 2digit numbers is to use your knowledge of place values and expanded form. This method can be especially helpful if you need to solve a problem in your head.
Imagine that you want to multiply 60 by four (60 x 4). Since 60 has a six in the tens place and a zero in the ones place, this means it's equal to six tens, or 10 x 6. You're multiplying 60 by four, and 60 = 10 x 6, so you can get the correct answer by solving this problem: 10 x 6 x 4.
You know that 6 x 4 = 24, and that any number times ten equals itself with an additional zero added on. For instance, 24 x 10 = 240. Putting this all together, we can say that 60 x 4 = 10 x 6 x 4 = 10 x 24 = 240.
Practice Problems
Complete these practice problems using the standard algorithm. Then check your work using the expanded form method, and verify your answers with the key below.
 1. 70 x 2 = ?
 2. 20 x 8 = ?
 3. 50 x 5 = ?
 4. 90 x 3 = ?
 5. 40 x 7 = ?
Answer Key
 1. 70 x 2 = 140
 2. 20 x 8 = 160
 3. 50 x 5 = 250
 4. 90 x 3 = 270
 5. 40 x 7 = 280
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