Counting Three Bills

Count the total: one 20 dollar bill, one 10 dollar bill, and one 5 dollar bill.

Identify each bill's value: 20 dollars + 10 dollars + 5 dollars = Three bills identified

Add the first two bills: $20 + 10 = 30$ = 30 dollars so far

Add the third bill: $30 + 5 = 35$ = 35 dollars total

Answer: The total is 35 dollars.

Counting Multiple Bills of the Same Type

Count the total: three 20 dollar bills and two 5 dollar bills.

Count the 20 dollar bills first: $20 \times 3 = 60$ = 60 dollars in twenties

Count the 5 dollar bills: $5 \times 2 = 10$ = 10 dollars in fives

Add both totals together: $60 + 10 = 70$ = 70 dollars total

Answer: The total is 70 dollars.

Counting a Mixed Collection

Count the total: one 100 dollar bill, two 20 dollar bills, one 10 dollar bill, and three 1 dollar bills.

Start with the largest bill: 100 dollars = 100 dollars so far

Add the twenties: $100 + (20 \times 2) = 100 + 40 = 140$ = 140 dollars

Add the ten: $140 + 10 = 150$ = 150 dollars

Add the ones: $150 + (1 \times 3) = 150 + 3 = 153$ = 153 dollars total

Answer: The total is 153 dollars.

Mistake: Confusing bill denominations (thinking a 10 dollar bill is worth 1 dollar)

Why: All bills can look similar in size. The number printed on the bill tells you its value.

Correct: Always look at the number printed on the bill: 1, 5, 10, 20, 50, or 100.

Mistake: Forgetting to count all the bills

Why: When counting quickly, it's easy to miss a bill in a stack.

Correct: Count each bill one at a time and set it aside after counting. Double-check your count!

Mistake: Adding incorrectly when bills repeat

Why: When you have multiple bills of the same type, mental math can get tricky.

Correct: Use multiplication for same-value bills: four 5 dollar bills = $5 \times 4 = 20$ dollars.

Paying at a Store

When you pay with cash, you need to count your bills to make sure you give the right amount.

A toy costs 27 dollars. You have a 20 dollar bill and a 10 dollar bill. Together that's 30 dollars, which is enough!

Counting Your Savings

Keeping track of money in your piggy bank or savings helps you know how close you are to your goal.

If you save two 10 dollar bills each month, after 3 months you have $20 \times 3 = 60$ dollars.

Q: Why do we have different bill denominations?

A: Different denominations make it easier to pay exact amounts. Imagine if we only had 1 dollar bills - you'd need 100 bills to pay 100 dollars! With a 100 dollar bill, you only need one.

Q: What's the best way to count a large stack of bills?

A: Sort the bills by denomination first (all 20s together, all 10s together, etc.). Then count each group separately and add the totals. This makes counting faster and more accurate.