Multiplying Rational Numbers

-3/8 x 4/5

• 3/10

• -3/10

• 1/10

• -5/6

Tags

CCSS.7.NS.A.2

CCSS.7.NS.A.3

-1 1/4 x -2 4/5

• 2/7

• -2/7

• -7/2 or -3 1/2

• 7/2 or 3 1/2

Tags

CCSS.5.NF.B.4

CCSS.5.NF.B.6

-3.14 x -3.6

• 11.304

• -11.304

• 113.04

• -1.1304

Tags

CCSS.6.NS.B.3

-145.23 x 3.5

• -5.08305

• 50.8305

• 508.305

• -508.305

Tags

CCSS.6.NS.B.3

CCSS.6.NS.C.5

-2 1/3 x -1 1/14

• 5/2 or 2 1/2

• -5/2 or -2 1/2

• 2/5

• -2/5

Tags

CCSS.5.NF.B.4

CCSS.5.NF.B.6

How do you know whether the answer to a multiplication problem is positive or negative?

• See if there are more negatives or positives

• Count the negatives. If odd then positive. If even then negative.

• Count the negatives. If odd then negative. If even then positive.

Tags

CCSS.6.NS.C.5

-2 x 3 x -4

• -12

• 12

• -24

• 24

Tags

CCSS.6.NS.C.5

-1 x -1 x -1 x -1 x -1

• 1

• -5

• 5

• -1

Tags

CCSS.6.NS.C.5

-5 x 9

• 45

• -45

• 4

• -13

Tags

CCSS.6.NS.C.5

-8 x -5

• 40

• -40

• 13

• -13

Tags

CCSS.6.NS.C.5