Adding
4.2 + 3.1
7.3
4.2 - 3.1
1.1
1.5 x 3
4.5
What two operations (adding, subtracting, dividing, or multiplying) is it most important for you to LINE up the DECIMALS?
Adding and Subtracting
Are 0.90 and .9 equivalent decimals?
Yes
7.32 + 5.8
13.12
38.61 - 5.04
33.57
0.9 x 6
5.4
What are the rules for adding decimals?
1. ______________ the decimals.
2. Fill in ____________.
3. ________.
4. Bring ____________________.
1. Line up the decimals.
2. Fill in the zeros.
3. Add
4. Bring the decimal down.
Are 0.009 and 0.090 equivalent decimals?
No
7.99 + 4.78
12.77
60.75
3.12 x 8
24.96
What are the rules for subtracting?
1. Line _________________.
2. ________________ zeros.
3. ______________.
4. ___________________________.
1. Line up the decimals.
2. Fill in the zeroes.
3. Subtract.
4. Bring the decimal down.
Give two equivalent decimals to
0.45
Options:
.45
.450
.4500
.45000
75.4 + 0.5919
75.9919
17.89123 - 4.52
13.37123
4.007 x 4
16.028
What are the rules for multiplying decimals?
1. ______________.
2. _________ the ________ of digits after the _________ in your problem.
3. Your answer will have that many _______ behind your decimal.
1. Multiply.
2. Count the number of digits after the decimal in your problem.
3. Your answer will have that many numbers behind your decimal.
List three equivalent decimals for
.809
Options:
0.809 0.80900
0.8090 0.809000000000000
.8090
.80900
3.72 + 6.0064
9.7264
Kelly's brother weighs 7.71 pounds. Her newborn kitten weighs 0.24 pounds. How much more does Kelly's baby brother weigh than her kitten?
7.47 pounds
Ms. Morgan bought 3.5 pounds of bananas at $0.51 a pound and 4.5 pounds of pineapple at $1.19 a pound. How much did she pay for the bananas and the pineapple?
$7.14
What are the rules for dividing decimals?
1. If the _________ has a decimal, move it over in both numbers.
2. Bring the decimal _____.
3. ___________ (Fill in zeros if you need to).
1. If the divisor has a decimal, move it over in both numbers.
2. Bring the decimal UP.
3. Divide
EXPLAIN YOUR REASONING.
Answers may vary.