Question

Jackson gave Lena this expression to evaluate: 14(8 + 12). Lena said that to evaluate the expression was simples

multiply the factors 14 and 20. Jackson told Lena she was wrong. He solved it by fir
as wrong. He solved it by finding the product of 14 and 8 and then
adding that to the product of 14 and 12.
a. Evaluate the expression using each student's method.
Lena's Method
Jackson's Method
b. Who was right in this discussion? Why?
*Refer to Grade 6, Module 4

Answer 1

see explanation

Explanation:

a) lena's method:

• 14(8+12)
• 14(20)=280

jackson's method:

• 14(8+12)
• 112+12
• 124

b) lena is right because when evaluating expressions, you have to follow PEMDAS. parentheses come before multiplication.

:)

Answer 2

Explanation:

Lena's method by prime

= 14 = 7 x 2 = 2/7 Factors or simply just 14 x 20 =280

= 20 = 10 x 2 = 2/10 Factors

= 2 x 2 =4 Cross multiply

= 7 x 10 = 70

Jackson's method by algebra and by adding to the product of 14 and 12

14(8+12)

112+ 160

= 280

Jackson was right in this discussion, as the process within-algebraic shows clarity of the two multiples; being 154 x 8 and 14 x 12, without this we cannot check for mistakes, and we cannot learn from correct answers as often.