Hope you enjoyed the video!
Thanks for watching!
You have remaining on your free trial.
4 Free Lessons Left
Get unlimited access to all videos and lesson plans with a membership.
So you can keep watching more great videos in class, ask your teacher or principal to get a School plan membership.
We hope you enjoyed trying 5 lessons!
Become a member to get full access to our entire library of learning videos, reading material, quiz games, simple DIY activities & more.
Become a member to get full access to our entire library of learning videos, quiz games, & more.
Plans & PricingWe now offer home science kits so you can do fun experiments at home.
Explore the KitCreate a free account to continue watching
Welcome to Our New Math Lessons!
Your subscription is currently only to our science lessons.
5 Free Math Lessons Left
Add Math To My Plan (+$50/yr)We hope you enjoyed sampling 5 Math Lessons!
Your subscription is currently only to our science lessons.
Add Math To My Plan (+$50/yr)0 Free Math Lessons Left
Create a free account
to watch this full video.
* no credit card needed *
Try it Free Continue with previewOops! It looks like your security settings are blocking this video 🙁
If you are on a school computer or network, ask your tech person to whitelist these URLs:
*.wistia.com, fast.wistia.com, fast.wistia.net, embedwistia-a.akamaihd.net
Sometimes a simple refresh solves this issue. If you need further help, contact us.
Create a free account to unlock all content!
Get Full AccessNEW! Bring the Fun Home with Our Epic Science Kits
Explore The KitsSolve Problems with Decimals (Using Models)
Sorry, student links are only for classroom & school accounts.
Please login to generate a student link.
Generate Student Link
- Show lesson plan & teacher guide
- Show answers to discussion questions
- Show video only
- Allow visiting of other pages
- Hide assessments
What you will learn from this videoWhat you will learn
- We’ll add, subtract, multiply and divide decimals using models.
- We will also learn how to use estimation to decide if our answer is reasonable.
- And that this knowledge can help us feed our pets, go hiking and even grow crystals!
- Discussion Questions
Before Video
Give the value of each digit in 5.39.ANSWER5 wholes, 3 tenths, and 9 hundredths
Every 10 hundredths can be regrouped as 1 tenth. So, 56 hundredths is 5 tenths and 6 hundredths.
Every 10 tenths can be regrouped as 1 whole. So, 48 tenths is 4 wholes and 8 tenths.
If I divide 63 wholes equally among 9 groups, each group has 7 wholes. 63 ÷ 9 = 7.
I can round 58 to 60, and 32 to 30. 60 × 30 is 1,800, which is close to 1,856. This is how I know my answer makes sense.
After Video
If you are calculating 3.64 – 2.14, which number should you represent using the fraction square model? What is the second step? ANSWERThe greater number, 3.64. Then, take away blocks that represent 2.14 in total.
I don’t have enough tenths to subtract 8 tenths, so I need to regroup 1 of the wholes as 10 tenths. Then, I have 2 wholes and 14 tenths. Now I can subtract 8 tenths from 14 tenths. The answer is what remains, 2 wholes and 6 tenths, or 2.6.
1.4 means 1 whole and 4 tenths. I need to multiply each number by 6, which is the same as skip counting sixes. 6 × 1 = 6. 6 × 4 tenths = 24 tenths. 24 tenths is the same as 2 wholes and 4 tenths, so altogether I have 8 wholes and 4 tenths, or 8.4.
No, Mimi needs to do some regrouping, starting with the smallest place, the hundredths place. 28 hundredths can be regrouped as 2 tenths and 8 hundredths. So, now there are 8 wholes, 12 + 2 = 14 tenths, and 8 hundredths. Next, regroup some of the tenths. 10 tenths can be regrouped as 1 whole, so the final answer is 9 wholes, 4 tenths, and 8 hundredths, or 9.48.
I can round 3.8 to 4 and 5.1 to 5. Multiply: 4 × 5 = 20. 20 is close to 19.38, so the answer makes sense.
- Vocabulary
- Place value DEFINE
Tells us the value of a digit based on its position in a number.
- Decimals DEFINE
Numbers that allow us to show parts of a whole.
- Ones place DEFINE
Shows the number of wholes.
- Tenths place DEFINE
Shows the number of parts out of 10.
- Hundredths place DEFINE
To the right of the tenths place, and shows us the number of parts out of 100.
- Models DEFINE
Visual tools that help us to represent numbers.
- Regroup DEFINE
When we have 10 of one place value, we can regroup to create 1 of the place value on its left.
- Place value DEFINE
- Reading Material
- Practice Word Problems
- Practice Number Problems
- Lesson Plan
- Teacher Guide