Equations

10 30 3 9 + 3 4 1 = 25 × 0.4 12.5 − 2.5 7 + 3 2 × 5 6 ÷ 0.6 18 − 8

Writing Equations

a mathematical sentence stating that two expressions are equal equation a mathematical sentence stating that two expressions are equal 2 + 4 = 6 n + 10 = 23

A number divided by 6 equals 2. = 2 n 6 = 2

12 decreased by a is 7. 12 − a = 7

The product of 9 and a equals 54. The sum of 73 and b equals 97. Dividing x by 7 is 4. A number decreased by 2 to the power of 3 is 11. x 7 = 4 n − 23 = 11

Writing an Equation for a Word Problem

lawns this week. Write an equation Last week, Mitchell earned $115 for mowing lawns. That is $35 more than he earned for mowing lawns this week. Last week, Mitchell earned $115 for mowing lawns. That is $35 more than he earned for mowing lawns this week. Write an equation to find how much money Mitchell earned for mowing this week. That is $35 more than he earned this week. $115 = w + $35

Write an equation to find how many students are in the class. Three children from the sixth-grade class remained at school after 12 children from the class went home on the school bus. Write an equation to find how many students are in the class. s = 3 + 12

Three children from the sixth-grade class remained at school after 12 children from the class went home on the school bus. s − 12 = 3

part whole s = 3 + 12 s s − 3 = 12 3 12 s − 12 = 3

The youth chamber orchestra has 23 members. Ten of the members are boys. Write an equation to find how many girls are in the orchestra. 23 = g + 10 23 23 − g = 10 g 10 23 − 10 = g

triple the score from the end of the first quarter. At halftime of the basketball game, one team’s score was 48. The team had tripled the score it had at the end of the first quarter. Write an equation to find the score at the end of the first quarter. The halftime score is triple the score from the end of the first quarter. 48 = 3 s

Evaluating and Relating Inequalities

< > less than greater than

2 > a + 15 19 − 3 17 16

< 11 + 3 3a 14 18

s − 12 = 3 s = 15

Complete #1−28 (even), #29−31 (all) on Student Text pp. 216−17.