teacher instructions: materials: ppt, copies of decimals core iii worksheet (copies will be...
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Teacher Instructions:Materials: PPT, copies of Decimals Core III Worksheet (copies will be available in workroom)- Work through each slide paying attention to the teacher notes. - At the end, hand out the worksheet and have students complete individually. - Have student switch papers and grade as a class.- Send the total number of students who have 100% on the problem set to Mrs. Kane and Mrs. Glyn-Anderson in an email
6th Grade CORE Lesson March 25, 2015
Standard: AZ-6.NS.B.3 Fluently add, subtract, multiply, and divide multi-digit decimals using the standard algorithm for each operation.
The Basic Steps:• Make sure the divisor is a whole number, if it isn’t move decimal point to right to
make it a whole number.
• If you moved the decimal point in the divisor, move decimal point in dividend the same number of places.
(Whatever you do to one side, do to the other!)
• Put decimal point directly above decimal point in the dividend.
• Estimate
• Divide as usual. ...
• Check your answer.
Why Estimate?• Before dividing your numbers, use one of the
estimating strategies you learned to see what the answer should be close to.
• When you divide, you can see if your answer is reasonable.
Example… To move or not to move?
Yes, move
Let’s do this together now
23.688 divided by .56
.56 23.688move decimalto the end to make this a whole number
Whatever you do toThe divisor, you do to The dividend
. Move the decimal up, then divide
Let’s do this together now
23.688 divided by .56
56 23688.4.
-22412
2
-11216-168
3
0
8
8
Special NoteIf a number does not show a decimal, the decimal is AT THE END!
Example:
1.2 234
there is an invisible decimal right here
Let’s do this together now234 divided by 1.2
1.2 234..0
In order to move the decimal in the dividend, we first had to add the decimal to the end of 234, then we could move it
Let’s do this together now
12 2340.1
.-1211
5
-1086-60
9
0
4
0
234 divided by 1.2
Working individually, complete the practice problems.
The class with the highest average of correct problem sets will win 50 HUSKY POINTS!!!