Multiplying 3-Digit Numbers

Contributor: Rachel Lewis. Lesson ID: 12085

Do you feel like multiplication problems make a monkey out of you? Multiplication gets trickier as the number of numbers increases. No sweat! Learn from games and practice how to solve these problems!

categories

Elementary

subject
Math
learning style
Visual
personality style
Otter, Golden Retriever
Intermediate (3-5)
Lesson Type
Quick Query

Lesson Plan - Get It!

Audio:

Maya has a problem. She works in the monkey exhibit at the zoo. The zoo needs her to decide how much money she will spend on food for the monkeys this year. To find the answer, Maya needs to multiply a multi-digit number.

• Can you help?

Let's see if we can feed these monkeys!

Maya spends \$352 a year to buy food for one monkey. The zoo has eight monkeys.

• How much money will the zoo spend on the monkeys’ food this year?

To solve this problem, we need to multiply!

We know Maya spends \$352 for one monkey. So, if the zoo has eight monkeys, we need to multiply \$352 by eight.

• But how do we multiply a 3-digit number by a 1-digit number?
 1 3 5 2 x 8 6 < Multiply the ones by 8. 2 x 8 = 16 Place the 6 in the ones place, and carry the 1 to the tens place.

 4 1 3 5 2 x 8 1 6 < Multiply the tens by 8. 5 x 8 = 40 Now, add the 1 + 40 = 41. Place the 1 in the tens place, and carry the 4 to the hundreds place.

 4 1 3 5 2 x 8 2 8 1 6 < Multiply the hundreds by 8. 3 x 8 = 24 Now, add the 4 + 24 = 28.

The zoo spends \$2,816 a year on food for the monkeys.

Watch another example of multiplying by ones, tens, and hundreds with the Math Antics’ video 3 digit by 1 digit multiplication. Take notes during the video. Write down the three steps you need to solve multiplication problems with 3-digit numbers:

After the video, go to the Got It? section for some practice problems!

Interactive Video