Home > CC1 > Chapter 1 > Lesson 1.2.3 > Problem1-70

1-70.

How many pennies are represented by each expression below? Homework Help ✎

1. $3+4(5)$

Remember to multiply first, then add.

$23$ pennies

2. $4(3)+7$

This one is similar to the one above.

3. $2(3)+5+4(2)$

One student, Christy, did it this way:

$(2)(3) = 6$
$6 + 5 = 11$
$11 + 4 = 15$
$15 × 2 = 30$

What did Christy do wrong?

Make sure you do what is inside the parentheses first.

$19$ pennies