Solving Multi-Step Problems by Reasoning with Units

A worksheet had 7 problems on it. If a teacher had 17 worksheets to grade and had already graded 8 of them, how many more PROBLEMS does she have to grade?

Suzy bought an Ipad for $432 and case for $57. If she gives the cashier $550, how much will she get back?

At the arcade Amy had 6 tickets she saved from the last time she went. This time she played a game 7 times and earned 5 tickets each time she played. How many tickets does she have now?

Akhira started her own landscaping business. She charges $6 an hour for mowing lawns and $11 for pulling weeds. In September she mowed lawns for 63 hours and pulled weeds for 9 hours. How much money did she earn in September? 

Janet's mother gave her $76 to go to the store. Janet bought 2 loaves of bread and 4 cartons of orange juice. Each loaf of bread cost $5 and each carton of orange juice cost $3. How much money does Janet have left?

Sally and Byron mow lawns in the summer. Sally mows 5 lawns each week. Byron mows three times as many lawns each week as Sally. Byron gets paid $20 for each lawn he mows. How much money does Byron get paid each week? Use the strip diagram in the picture to help solve the problem.

Jarrod delivered 63 newspapers each day for 5 days. He delivered 78 newspapers on Saturday and 93 newspapers on Sunday. How many newspapers did Jarrod deliver that week?

Julia used 3 memory cards to take pictures on her vacation. Each memory card holds 28 pictures. She printed 2 copies of each picture. How many pictures did Julia print?

Each student purchased a box of 24 crayons and 18 colored pencils. There are 20 students in the class. How many crayons and colored pencils did the class purchase?

For lunch, Martin buys a sandwich for $4, an apple for $1, and a drink for $2. How much change will Martin receive if he pays with a $20 bill? Use the strip diagram in the picture to help solve the problem.