Equations: Adding and Subtracting

What is the main task when evaluating equations?

• to cancel numbers
• to isolate the variable

y - 71 = 211

• 280
• 140
• 282
• 380

s + 42 = 75

• 33
• 117
• 36
• 43

x - 5.5 = 13.53

• x = 8.03
• x = - 8.03
• x = - 19.03
• x = 19.03

y+25=80
What steps do you need to solve this problem?

• Add 25 to both sides
• Subtract 25 to both sides
• Divide 25 on both sides
• Multiple 25 on both sides

Which equation matches this phrase:

"twelve is the difference of a number and five"

• 12 - n = 5

• 5 - 12 = n

• n - 5 = 12

• n - 12 = 5

What is the value of "x" in this equation?

192 + x = 450

• x = 642

• x = 262

• x = 258

• x = 342

Which equation matches the following:

"Eight less than a number is nineteen"

• 8 - 19

• 8 - n = 19

• n - 8 = 19

• 19 - 8 = n

 $m\ +\ 2\frac{3}{4}\ =\ 11$  

Solve for "m"

•  $13\frac{3}{4}$  

•  $9\frac{3}{4}$  

•  $9\frac{1}{4}$  

•  $8\frac{1}{4}$  

What needs to be done to solve this equation?

28 = p + 15

• subtract 28 from both sides of the equation

• subtract 15 from both sides of the equation

• add 28 to both sides of the equation

• add 15 to both sides of the equation