7th Grade Math – Mr. Miller Number Sense & Critical Thinking

CLASSWORK 2.10

Multiple Selection Questions. These are a little different than your mother’s and father’s “multiple choice” type questions in that you must SELECT ALL correct answers – of which there is usually MORE THAN ONE. In order to accomplish this, you must carefully review ALL of the (usually 4 to 6) possible choices. This classwork will give you a little practice on this type of question while reviewing rational number operations… [1] In the table at right, CIRCLE ALL mistakes below that were made in this problem and 9.4 + (-2.37) CROSS OUT those which were not: 2.37 A. Applied rules of integer addition incorrectly to do wrong operation − 9.4 B. Lined up decimal places incorrectly 1.43 C. Subtracted in the incorrect order D. Did not borrow when needed in subtraction (-1.43) E. Answer has incorrect number of places after decimal point F. Placed incorrect sign in final answer

A B C D E F In the table at right, CIRCLE ALL mistakes below that were made in this problem and

[2] 7.411

2.2 163.9 154 99 88 11

A B C D E F In the table at right, CIRCLE ALL mistakes below that were made in this problem and

A. Did not move decimal point in divisor and dividend B. Did not place decimal point correctly in quotient C. Did not divide 163 by 22 correctly D. Did not subtract correctly to obtain remainder E. Remainder of 11 not equal to 0.011 in quotient F. Did not divide until no remainder or a repeating pattern exists

[3]

𝟑

𝟓

𝟖

𝟔

2 + 4

CROSS OUT those which were not:



𝟗

𝟏𝟓

𝟐𝟒 𝟐𝟒

𝟐𝟒

= 2 + 4 = 6 𝟒𝟖 𝟏

[4]

= 6 𝟐 𝟓

𝟑

𝟕

𝟓

1 ÷ 2 𝟏𝟓

𝟏𝟑

𝟕 𝟏𝟓

𝟓 𝟓

= • =

𝟕 𝟑𝟓

𝟏𝟗𝟓

𝟏𝟑

𝟕

𝟑𝟗

𝟑

1 • (–0.45) 𝟓 𝟖

𝟗

= • (– ) =

𝟓 𝟖

•

𝟓 𝟏 𝟑𝟐

𝟐𝟎 𝟐𝟎 𝟒 𝟗

𝟐

= 3 𝟗



Did not obtain a common denominator Obtained an incorrect common denominator Obtained an incorrect numerator for either fraction Incorrectly added the numerators Incorrectly added the denominators Reduced the final answer into lowest terms incorrectly

A B C D E F In the table at right, CIRCLE ALL mistakes below that were made in this problem and

= ÷

[5]

A B C D E F In the table at right, CIRCLE ALL mistakes below that were made in this problem and A. B. C. D. E. F.

CROSS OUT those which were not:





CROSS OUT those which were not:

𝟗

A. B. C. D. E. F.

Failed to obtain a common denominator Incorrectly converted mixed number to improper fraction Did not reduce diagonally in a division problem Did not convert division into multiplication by the reciprocal Incorrectly multiplied numerators or denominators Reduced the final answer into lowest terms incorrectly

CROSS OUT those which were not:

A. B. C. D. E. F.

Incorrect conversion of decimal to fraction Did not change multiplying by a negative to dividing by a positive Incorrect use of multiplying by the reciprocal Incorrectly reduced prior to multiplying Multiplied numerators or denominators incorrectly Incorrectly reduced the final answer into lowest terms

A B C D E F