Addition
Subtraction
Multiplication
Division
100
37.9 + 127
37.9 LINE UP THE DECIMALS and fill in zeros
+ 127.0
164.9
100
57.3 - 21
57.3
- 21.0 LINE UP THE DECIMALS and fill in zeros
36.3
100
67 * 4
67 4 * 7 = 28 (carry the 2)
* 4 4 * 6 = 24 + 2 = 26
268
100
75 div 5
200
200 + 0.46
200.00 LINE UP THE DECIMALS and fill in zeros
+ 0.46
200.46
200
702 - 48.4
702.0 LINE UP THE DECIMALS and fill in zeros
- 48.4
653.6
200
11*3.5
11 5 * 1 = 5
* 3.5 5 * 1 = 5
55 put a zero to hold the spot, 3 * 1 = 3
+ 330 3 * 1 = 3
38.5 add columns, then move the decimal
200
How do you "read" the following? Perform the operation.
82 div 6
Eighty-two divided by six. FIRST number goes in the house.
300
473.09 + 1.478
473.090 LINE UP THE DECIMALS and fill in zeros
+ 1.478
474.568
300
Do you agree with the work below? Justify your answer. If applicable, provide the correct answer to receive the points for this question.
83.7 - 5.11
NO!
This student did not line up the decimals correctly.
The correct answer is 78.59
300
68.2 * 7
68.2 7 * 2 = 14 (carry the 1)
* 7 7 * 8 = 56 + 1 = 57 (carry the 5)
477.4 7 * 6 = 42 + 5 = 47, move the decimal
300
Which number goes in the house when re-writing an expression like
93 div 3
The first number! So, 93.
400
Esme added 67.93 to 4.9. Do you agree with her work? Justify your answer. If applicable, provide the correct answer to receive the points for this question.
No. Did not line up decimals. Did not add correct place values.
The correct answer is 72.83
400
271.65 - 199.872
Do you agree with this work? Justify your answer. If applicable, provide the correct answer to receive the points for this question.
NO! Order matters! 271.65 should be on top. The correct answer is 71.778.
400
Do you agree with the following work? Justify your answer. If applicable, provide the correct answer to receive the points for this question.
250.776
400
567.6 div 12
500
What is THE most important thing to remember when adding decimals?
LINE UP DECIMALS!
500
Name two important things when subtracting decimals.
Line up decimals
Order matters!
Be mindful of place values
Borrow correctly
Check your answer/work
500
Do you HAVE to line up decimals when multiplying?
NO. You will count place values and move the decimal on the final answer accordingly.
500
How can you read the following? What is the solution?
20/5
twenty divided by 5
think of 20 items into 5 piles
4