2

3

x

y

2

3

x

y

minus times a minus makes a plus

minus times a plus makes a minus

2

3

x

y

minus times a minus makes a plus

minus times a plus makes a minus

2

3

x

y

minus times a minus makes a plus

minus times a plus makes a minus

12

5

x

y

4

9

x

y

1

1

x

y

minus times a minus makes a plus

minus times a plus makes a minus

22

37

x

y

calculator perhaps?

4.1

3.2

x

y

calculator? can you estimate first?

5

10

x

y

try without a calculator

100

1000

x

y

try without a calculator

7

4

x

y

minus times a minus makes a plus

minus times a plus makes a minus