Multiplying Decimals by Bases of 10
Dividing Decimals by Bases of 10
Adding
&
Subtracting Decimals
Word Problems with Decimals
Error Analysis
100
7.8 x 10
What is 78 or 78.0
100
6.3 ÷ 10 =
What is 0.63
100
24.8 + 45.2
70 or 70.0
100
Karla went to the store to buy candy and her total was $12.65. She gave the cashier $15.00. What is her change?
What is Karla received $2.35 in change
100
is the problem correct or incorrect? 3.98 + 1.7 = 46.0
Incorrect, the correct answer is 5.68
200
6.56 x 100
What is 656 or 656.0
200
866.1 ÷ 100 =
What is 8.661
200
6.1 - 2.0
4.1
200
Miguel walks 0.7 miles to school everyday. Ana walks 1.2 miles and Elsa 3.4 miles. How many miles do they walk all together?
What is they walk 5.3 miles miles together.
200
Is the answer correct or incorrect? 18 - 3.45 = 14.55
Correct! :)
300
3.2 x 1000
What is 3200 or 3200.0
300
7832.45 ÷ 100 =
What is 78.3245
300
4568.6 + 23.8
4592.4
300
A swimmer is in a 100 meter race. She swims the first half of the race in 32.34 seconds and the last half of the race in 34.83 seconds. How long did it take her to swim the whole race?
What is 67.17 seconds to swim the whole race.
300
Is the answer correct or incorrect? 4.659 + 2.00 = 48.59
Incorrect, the answer is 6.659
400
0.67 x 1000
What is 670 or 670.0
400
656.899 ÷ 1000 =
What is 0.656899
400
734.1 - 9.4
724.7
400
Jane buys an apple for $0.75 and pays with a $5 bill. How much change will she get?
What is $4.25 in change Jane will receive.
400
The problem is incorrect. Identify the error. 29.0 - 2.4 = 27.6
The error is that the student did not regroup (carry) to subtract 4 from 0.
500
420.563800 x 1000
What is 420563.8 or 420563.80
500
0.004 ÷ 1000
What is 0.000004
500
7789.24 - 78.734
7710.506
500
Jesse took a walk to Best Buy and bought two video games. The first video game costs $45.99 and the second video game costs $86.33. He gave the cashier $150. How much will Jesse receive in change?
Jesse will receive $17.68 from the cashier
500
Is the problem incorrect or correct? If it is incorrect, find the error. .323 + 782 = .1005
Incorrect, the correct answer is 782.323. The error was that they didn't line up the decimals/place value and didn't bring down the decimal
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