Rules
Rounding
Rounding
Evaluating
Buffet
100
Rule for subtracting integers
Change the sign, add a line
100
56, 175; ten thousands
60,000
100
639.0; ones
639
100
(12-30 ÷ 3) (-9-2) -7
-29
100
(7- - 2- 9 - - 12) x 5 ÷5
12
200
Rule for multiplying and/or dividing integers
+ * or / by a + = + + * or / by a - = - - * 0r / by a - = +
200
6,001,729; millions
6,000,000
200
97.109010; thousandths
97.109
200
((-9-1) x 2) ÷ (6 -1) - - 3
-1
200
|77| _____ |-79|
absolute value of -79 is greater
300
Rule for adding/subtracting fractions
Find a common denominator
300
49.99; tenths
50.0
300
392; hundreds
400
300
-9 – 14 x -2 - |-8 x-11|
-69
300
4.9998; thousandths
5.000
400
Rule for dividing fractions Rule for multiplying fractions
Multiply by the reciprocal Multiply across
400
4.2106048; hundred-thousandths
4.21060
400
1.99; tenths
2.0
400
(6- - 2) ( -4 –(-1 +11 -11))
-24
400
-9 + |13- -13| – 15 - - 1
3
500
What happens when you divide by a decimal between 0 and 1? What happens when you multiply by a decimal between 0 and 1?
Increase Decrease
500
8.69916; hundredths
8.70
500
3.896; hundredths
3.90
500
9 ÷ -1 (-14 - - 12)(-7 +9)
36
500
Come up with your own question and answer for the other team
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