Download Whole Number and Decimal Operations - Mendenhall-Jr-PLC

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Parsheena Berch
Resource: JBHM material
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Whole Number and Decimal
Operations
Bell Ringer:
Page 15 in JBHM binder (DOK 1)
Guided Practice:
• Subtraction of Whole Numbers
• When you perform subtraction, you are doing
the opposite of addition. The number you are
starting with is the minuend. The number you
are taking away is the subtrahend. Your
answer is called the difference. In setting up a
subtraction problem, the numbers must
always line up correctly.
Introduction/Focus:
• Why do we need to learn to subtract?
• Would you want to know at times how many
points the Tigers scored more than the
Trojans?
• Let’s say the Tigers scored 48 points and the
Trojans scored 23 points.
• By how many points did the Tigers win?
• There are several words that indicate the
operation of subtraction: minus, less, less
than, difference between, decreased by, etc.
• Remember to line the columns up by place
value.
• Turn to page 45 and 46 in your binder notes.
765
- 453
919
-112
699
-572
591
-370
9,345,234
-5,123,456
Because 4<6 you have to borrow: 3 tens = 2 tens
+1 ten.
Borrow 1 ten from the tens column and write 10
in the ones column.
Add the borrowed 10 to the 4 and change the 3
to a 2
Always check your answer!
9,345,234
-5,123,456
4,221,778
so
4,221,778
+5,123,456
9,345,234
Independent Work/Activity: (DOK 2)
• Two number cubes
• Each student is to roll a number cube seven times and
record the number he or she rolls.
• Each roll of the number cube provides a digit for a
seven-digit number. Each pair of students will add the
numbers created by the cube.
• Compare your answers. All work should be shown to
receive credit.
• You must create five problems a piece and work them
correctly by showing all of your work to receive your
grade.
Closure:
• Explain the process of adding and subtracting
whole numbers using complete sentences.
Homework:
1. 5,083,693 – 2,968,395
2. 378,562 – 98,648
3. 45,200 – 4,587