Cogito
Grade 2 Math · Chapter 7 · Lesson 3
Counting Mixed Coins
Start with the biggest and work down.
10 problems · about 13 minutes · 2.MD.C.8
What this lesson teaches
The child finds the value of a mixed coin collection by starting with the largest coin.
- Sort the coins by kind first.
- Count from the biggest value down.
- Change your skip-counting step as you move to the next pile.
Warm-Up Review
From earlier lessons. Loosen up before the new work.
2 problemsReview — Counting Coins of One Kind: 5 dimes are worth how many cents?
Answer 50
Why 5 dimes is 50¢.
Review — Meet the Coins: How many cents is a dime worth?
Answer 10
Why A dime is 10¢.
Warm Up
Straightforward practice. Get the method working first.
4 problems2 quarters and 3 dimes. How many cents?
Answer 80
Why 50 + 30 = 80¢.
Which coin should you count first?
Answer The one worth the most.
Why Start with quarters and work down.
2 dimes and 3 nickels. How many cents?
Answer 35
Why 20 then 25, 30, 35.
3 quarters and 2 pennies. How many cents?
Answer 77
Why 75 then two more.
Build It Up
The same ideas with more to keep track of.
2 problems1 quarter, 1 dime, 1 nickel. How many cents?
Answer 40
Why 25, 35, 40.
1 quarter, 1 dime, 1 nickel. How many coins?
Answer 3
Why Count the objects.
Stretch Yourself
Mixed problems. Work out what kind of question it is before you start.
2 problemsIn a Pocket: 1 quarter, 2 dimes and 4 pennies. How many cents is that?
Answer 49 cents
Why 25 + 20 + 4 = 49¢.
How Many Coins?: 1 quarter, 2 dimes and 4 pennies. How many coins is that?
Answer 7 coins
Why 1 + 2 + 4 = 7 coins.