Algebra 1 Common Core Student Edition, Grade 8-9

a Lesso n Ch eck^

Do y o u k n o w H OW?

Find each sum or difference.

0 7' -3 2 5 4' 3 r

+ 2. —

.-4 5 J 4 - 1 ,- i o_ .- 3 3

1.

Find each product.

3. 2

(^40 55)
o^1

4. -6
   .-2 1 2. to—3 J

spa. a m a. Bn A g r - u MATHEMATICAL

Do yo u UN DERSTAND? {j& p PRA CTICES

5. Vocabulary How many elements are there in a
   3 X 3 matrix?


6. Er r o r A n a l y si s A student
   added two matrices as
   shown at the right. Describe
   and correct the mistake.


7. Open-Ended Write two different 3 X 3 matrices.
   Then add your matrices.

Pr act i ce an d Pr o b l em - So l v i n g Ex er ci ses

.1 ^ Pr a c t i c e Find each sum or difference.

MATHEMATICAL

PRA CTICES

4/B See Problem 1.

8.

1 - 1 + 0 1 -3 6“ -2 5" 5 2 ‘7 —4

9. — 10. —
   0 1. .1 -1. 2 0. 2 0. .-1 8. .0 2.

_4 -1~ "-2 0" 0 0.4" "l.8 -5 4.7 -0 .3 " 2.3 7.3

11. 20 + 3-1 12. -2 5.3 + 7.1 0 13. 2.9 0.7 - -5.1 0.4

3 5 -3 5 1.2 3.7 0.3 2.3 -3.5 1.3 4.2 0

Find each product.

14. 4

4ld See Problem 2.

"6 -3 3 - 1 5.3 -1.2 ‘3.8 2.1 7'

15. -2 16. 0 17. -5
    .0 5. .7 -2. .- 1 .8 0.6. .9.4 -6 0.

"3 4.7 ~ ~4 7.5 ~ ~-l 8.2 ~ 8.3 -3 0"

18. 2.7 0 -3 19. -3.1 9 -5 20. 8.3 0.3 -4.1 21. -0.2 4.5 5.6 1
    5.7 2.7 1 4.6 6.2 9.5 -1 2.9 7


19. Sports For a certain city, the tables below show the numbers of participants in Se e Pr o b l e m 3.
    various sports in 2005 and 2010. Which sport had the greatest numerical increase in
    student participation between 2005 and 2010? Find your answer using matrices.

Sp o r t s Pa r t i c i p a t i o n , 2 0 0 5 Sp o r t s Pa r t i c i p a t i o n , 2010

bv-xxX: StudentslEESE^ B t t ESSf li Students HjQQH

Baseball 739 215 B a s e b a ll 8 92 351

Basketball (^1023437) ■Basketball 1114 483
Football 690 58 Football 653 64
Soccer 1546 42 Soccer 1712 37
0
Po w erAlg eb ra.com Lesso n 12-1 Organizing Data Using M atrices^729