Jamal buys 15 pencils for $0.90 each and a notebook for $1.25. The cashier says the total is $32.25, but Jamal believes there was a mistake.

Which equation could he use to check the reasonableness of the total?

15 * 1 + 1 = 16

15 * (1 + 1) = 30

15 * 9 + 1 = 136

15 * (9 + 1) = 150

Question

Mathematics

Alvin Sparks

13 July, 11:23

Jamal buys 15 pencils for $0.90 each and a notebook for $1.25. The cashier says the total is $32.25, but Jamal believes there was a mistake.

Which equation could he use to check the reasonableness of the total?

15 * 1 + 1 = 16

15 * (1 + 1) = 30

15 * 9 + 1 = 136

15 * (9 + 1) = 150

+2

Answers (1)

Know the Answer?

Zachery Meza · Answer 1

15 * 1 + 1 = 16

Step-by-step explanation:

15 pencils for $0.90 = 15*.90

1 notebook for 1.25 = 1*1.25

Add them together

15*.90+1*1.25

We can round. 90 to 1 dollar an 1.25 to 1 dollar

15*1 + 1*1

15+1 = 16

Jamal buys 15 pencils for $0.90 each and a notebook for $1.25. The cashier says the total is $32.25, but Jamal believes there was a mistake.Which equation could he use to check the reasonableness of the total?15 * 1 + 1 = 1615 * (1 + 1) = 3015 * 9 + 1 = 13615 * (9 + 1) = 150

Jamal buys 15 pencils for $0.90 each and a notebook for $1.25. The cashier says the total is $32.25, but Jamal believes there was a mistake.

Which equation could he use to check the reasonableness of the total?

15 * 1 + 1 = 16

15 * (1 + 1) = 30

15 * 9 + 1 = 136

15 * (9 + 1) = 150