Adding and Subtracting Decimals

When adding and subtracting decimals, what is always the first step?

• Subtract the tenths place

• Line up the decimals place

• Add a zero after the decimal point

• Keep, Change, Flip

Tags

CCSS.5.NBT.B.7

5.432 --> What place value is the 4 in?

• Ones

• Tenths

• Hundredths

• Thousandths

Tags

CCSS.5.NBT.A.3A

34.875 --> What place value is the 7 in?

• Tens

• Tenths

• Hundredths

• Thousandths

Tags

CCSS.5.NBT.A.3A

When adding or subtracting should you start on the place value farthest to the left or right?

• Far Right (smallest value place value)

• Far Left (largest value place value)

Tags

CCSS.2.NBT.B.7

When adding, if a number goes over 10, what do you do? For example 5.4 + 3.9; the 9+4 is 13.

• This is impossible, you've done something wrong in the set up

• Just write the whole number underneath.

  So the answer would be 8.13

• The "1" carries over to the next place value to the left.

  So the answer would be 9.3

• You must borrow 1 from the next place value

Tags

CCSS.5.NBT.B.7

When subtracting which number do you always put on top?

• The largest number

• The smallest number

• Whichever comes first in the question

• Your favorite number

Tags

CCSS.7.NS.A.1C

If you subtract and the number on top is smaller than the number on the bottom, what do you do?

For example 5.4 - 1.6 --> 4 is smaller than 6.

• You must borrow one from the next place value to the left.

  5.4 would turn into a 4 and a 14

• Just subtract anyway.

  4 - 6 is 2.

Tags

CCSS.5.NBT.B.7

If the numbers you're adding or subtracting have different number of place values what can you do?

For example 6.4 - 3.19

• Just delete that last place value (get rid of the 9).

• Don't add or subtract that place value.

  6.4 - 3.19 = 3.39 (the 9 just drops down)

• There's nothing you can do but give up all hope in humanity.

• Add 0's to the right, it doesn't change the value of the number.

  6.4 = 6.40

Tags

CCSS.5.NBT.B.7

Can you add zeros anywhere you want to a number? For example if 6.4 = 6.40 can I also say 6.4 = 60.4?

• No. Zero's cannot be added between numbers, just at the ends.

• Yes. Zero's are meaningless in every possible way.

Tags

CCSS.5.NBT.A.4

2.5 + 1.3

• 3.8

• 1.2

• 4.4

• 8.3

Tags

CCSS.6.NS.B.3