ADDING AND SUBTRACTING DECIMALS (1) GRADE 3

Hello, How are you doing? Today, we are going to start a new lesson on Decimals.

Decimal A number that uses place value and Decimal point to show tenths and hundredths. Example – 0.53, 0.86 Places in each Decimal – There are two places in each of the decimal given below. Example – 0.32, 0.47

Add Decimals using Models Step 1: Use one color to shade the first addend. Step 2: Use different color to shade the other addend. Step 3: In the place value chart, write the total amount.

To add = 0.75

Steps to add decimals.  Line up the decimal points.  Start with the hundredths, then tenths and add each place.  Regroup if needed.  Place the decimal point between the ones and the tenths.

Add Line up the decimal points and add each place value Thus, = 1.6

Find

Peter spend $4.26 for the lunch. Roger spend $6.25 for the lunch. How much did they spend altogether?

Add 2.67 and 2.56 on a chart Ones.Tenthshundredths

Add

Which is true about a) b) c) d)

Find the sum of the decimal numbers shown in the grid.

Regrouping Regrouping is required if there are more than 9 tenths in the tenths place. In case of regrouping, put 1 over the ones in the addend. 11 tenths can be regrouped to 1 one and 1 tenths.

Which among the following is greater than 1? a) b) c) d)

Which is correct? a) = 42.5 b) = 4.25 c) = 425 d) =0.425

ASSESSMENT

1.Add

2.At a store, Peter buys a juice can for $2.69 and a pack of paper clips for $0.84. How much did he spend in all?

3.Peter saved $4.25. Alex saved $1.63 more than Peter. How much did Alex save?

4.Diana drove 4.20 Kilometer from her home to office and drove the same distance back. How much did she drive in all?

5.Serene buys a book on music. It costs $4.05. How much does he spend for 2 of these books?

6.Choose the right answer for the sum a) 7.18 b) c) d) 17.18

7.Irene and her two friends went for a movie. Each ticket to the movie was $5.25. They spend a total of $3.26 on popcorn. How much did they spend in all?

8.Ronald saved $4.50. His mother gave $1.20. How much does he have now?

9.The height of the Tomato plant was 1.25 inches last week. It grew 0.23 inches this week. How tall is Tomato Plant now?

10.Alan and Juliet spend $4.35 on lunch each. How much did they spend in all?

Recap Decimals Add decimals using Models Steps to add decimal Regrouping Solved Examples Unsolved Problems

Well Done! Now Practice worksheets on the Lesson.