Cogito
Grade 2 Math · Chapter 7 · Lesson 5
Money Problems
Buying, paying, and working out the change.
10 problems · about 14 minutes · 2.MD.C.8, 2.OA.A.1
What this lesson teaches
The child solves word problems involving coin values, totals, and change within 100¢.
- Add the prices to find the total cost.
- Change is what fills the gap up to what you paid.
- Work out what your coins are worth before deciding anything.
Warm-Up Review
From earlier lessons. Loosen up before the new work.
2 problemsReview — Dollars and Cents: How many quarters make one dollar?
Answer 4
Why 4 quarters is $1.
Review — Counting Mixed Coins: 2 quarters and 3 dimes. How many cents?
Answer 80
Why 50 + 30 = 80¢.
Warm Up
Straightforward practice. Get the method working first.
3 problemsPay 75¢ for a 55¢ item. What is the change?
Answer 20
Why The change is 20¢.
What is change?
Answer The gap between what you paid and the price.
Why Change is the missing part between price and payment.
Pay 50¢ for a 20¢ item. What is the change?
Answer 30
Why 50 − 20.
Build It Up
The same ideas with more to keep track of.
1 problemA 40¢ and a 35¢ item. What do they cost together?
Answer 75
Why 40 + 35.
Stretch Yourself
Mixed problems. Work out what kind of question it is before you start.
4 problemsPay 100¢ for a 78¢ item. What is the change?
Answer 22
Why What goes with 78 to make 100?
The Sweet Shop: A lolly costs 30¢ and a sticker costs 25¢. What do they cost together?
Answer 55 cents
Why 30 + 25 = 55¢.
Paying With a Dollar: Leo pays 100¢ for a 65¢ pen. How much change does he get?
Answer 35 cents
Why 100 − 65 = 35¢.
Enough or Not: Ana has 3 dimes. A pencil costs 45¢. Does she have enough?
Answer No. She has only 30¢.
Why 3 dimes is 30¢, which is less than 45¢.