4.1+Rising+and+Falling+Temperatures

Adit Mahmood 4/22/09 Block B** Investigation 4: Multiplying and Dividing Integers How do I multiply and divide integers?
 * 4.1
 * A1. Suppose the temperature changed by an average of 3 degrees. Copy and complete the table below and use it to find the total temperature change over 5 hours.**



Number of hours 1 2 3 4 5 Total temperature change +3 degrees +6 degrees +9 degrees +12 degrees +15 degrees


 * A2. Write a multiplication sentence that represents total change in temperature for the first five hours. Write a multiplicaton sentence that represents the change for the ten hours.**

+3*1= +3 degrees +3*2= +6 degrees +3*3= +9 degrees +3*4= +12 degrees +3*5= +15 degrees

+3*6= +18 degrees +3*7= +21 degrees +3*8= +24 degrees +3*9= +27 degrees +3*10+ +30 degrees


 * B1. Suppose the temperature changed by -3 degrees. Copy and complete the table below for the first five hours.**

Number of hours 1 2 3 4 5 Total Temperature change -3 degrees -6 degrees -9 degrees -12 degrees -15 degrees


 * B2. Write a multiplication sentence for the first five hours. Write a multiplication sentence for the entire 10 hours.**

-3*1= -3 degrees -3*2= -6 degrees -3*3= -9 degrees -3*4= -12 degrees -3*5= -15 degrees

-3*6= -18 degrees -3*7= -21 degrees -3*8= -24 degrees -3*9= -27 degrees -3*10= -30 degrees


 * C1. Write the addition sentence from each number line below.

C2. Write the multiplication sentence from each number line below.**

0+2+2+2=6 2*3=6

0+-3+-3=-6 -3*2=-6

0+-2+-2+-2+-2=-8 -2*4=-8


 * D. Make up a situtation for -4*10**

In Springfield the temperature went down by an average of -4degrees per 1.2 months. What was the temperature after 10 months?

-40 degrees after 10 months. E1. 5*-4=-20
 * E. Find each product **

E2. 20*-4=-80

E3. -4*20=-80

E4. -5*4=-20

The temperature is 16 degrees. The temperature is -40 degrees.
 * F.U**
 * 1. Suppose the temperature changed by +2 per hour from it’s low of **
 * -4 degrees at 3:00 a.m. What will the time be at 1:00 p.m? **
 * 2. Suppose the temperature changed by -1.5 degrees per hour from the high of +25 degrees at noon. What will the temperature be at 10:00 p.m?**
 * 3. When you add a positive and a negative number the result is positive or negative. But will it be the same for multiplication? **

No it wouldn’t be the same if you multiply a positive and a negative. you would always get negative.