How to Write an Equation

Which equation matches this phrase:
n divided by four is ten

• 10n = 4

• n/4 = 10

• 10 + x = 4

• n - 4 = 10

Write an equation for the given situation. The total number of piano lessons (p) minus the 3 completed lessons equals 15.

• 15 - p = 3

• 3 + 15 = p

• 3 - p = 15

• p - 3 = 15

Write an equation for the following phrase:

The product of four and a number is twelve.

• 12x = 4

• 4x = 12

• 4(12) = x

• 4 + x = 12

Write an equation for the following phrase:

120 students divided into g equal groups is 20 students per group

• 120/g = 20

• g/120 = 20

• g/20 = 120

• g + 20 = 120

Mathematical Equivalence

ON

Write the equation of the line.

Mathematical Equivalence

ON

• Joanna spends $50 to buy a cardigan for $20 and 3 identical T-shirts. Howmuch did each T-shirt cost?
• Carolyn is swimming a total of 50 feet. If she swims 20 feet in 3 attempts, how far does she have left to swim?
• Anita has 50 cards. She divides them equally among her three friends and keeps the remainder. How many cards does she give to each friend and how many does she keep?
• Kim bought 3 boxes of strawberries for $20 and sold them for $50. How much did she earn on each box?

Pete mows lawns for 15 dollars per hour (h). Write an equation that represents the relationship between hours mowed and total profit (p).

• 15p = h

• ph = 15

• 15h = p

• 15 + h = p

Crayola sells each marker for the same price. Max bought 7 markers for $14. Write an equation to express how much 1 marker will cost.

• 7 x m = $14

• 7 - m = $14

• m + 7 = $14

• 7/m = $14

Last Friday Jennifer had $23. Over the weekend she received some money for a good report card. She now has $41. Write an equation to expression how much money Jennifer received?

• $23 x r = $41

• $23 + r = $41

• $23 - $41 = r

• $23/r = $41