Bridges U3M2S1

I can subtract decimals, read them, and tell that each digit represents 10 times the number on the right, and 1/10 of the number on its left.

Multiple Select

Choose a job where you would need to be able to subtract decimals.

• A. bank teller

• B. business owner

• C. vet

• D. sales person

Open Ended

Let's start with a problem string.

What's 43-4?

​How did you solve it?

​43 - 4 = 39

Open Ended

How about 52-49?

​52 - 49 = 3

​​How did you solve it?

Multiple Choice

Remember when we did fractions? They were parts of a whole.

So, what are decimals?

• A. When you have too many

• B. When you turn the volume really loud

• C. Parts of a whole

• D. The change in your pocket

Open Ended

Let's throw in some decimals....

19.2 - 18.9 = ?

​19.2 - 18.9 = 0.3

​Is this how you solved it?

Open Ended

Let's try another one.

17.1 - 0.15 = ?

​17.1 - 0.15 = 16.95

​Is this how you solved it?

Open Ended

This one's tricky...

34.3 - 0.4 =

​34.3 - 0.4 = 33.9

​Is this how you solved it?

Open Ended

Last One!

31.3 - 30.8 = ?

​Is this how you did it?

​31.3 - 30.8 = 0.5

Multiple Choice

When you add or subtract decimals with the standard algorithm, what do you always need to remember to do with the decimals?

• A. Just erase them. They get in the way.

• B. Put them wherever you want. It doesn't matter.

• C. What's a decimal?

• D. Line them up, up, up, and we solve them!

The "Line Them Up, Up, Up, and We Solve Them" was a classic video that we listened to last week.

But, here's another classic.

I hope it runs through your head all day!

​Let's look at page 81

in your Student Books!

​Remember when we took the Pre-Assessment?

This part of the test seemed to be quite a struggle.

​Here's how the class did on that part of the pre-test.

What do you notice?

​I guess we better pay attention! This is something we definitely need to learn!

​If you put both numbers in a place value chart, the 2 in 5.200 is in the tenths place, and the 2 in 5.002 is in the thousandths place. Tenths is bigger.

Let's keep going with our

Home Connections book,

pages 45 & 46.

Poll

How do you feel about adding and subtracting decimals?

Poll

How do you feel about putting decimals into word form?

Poll

How do you feel about knowing that each digit represents 10 times the number on the right, and 1/10 of the number on its left?