Money Combinations

Grade 2 · measurement · 100 practice problems · read aloud

🔊 Listen to this explanation

💰 Money Combinations

What is this? Money combinations help us figure out different ways to make the same amount using coins and bills. This is useful when you're buying things and need to pay with the coins you have!

How to Solve Money Problems

  1. Start with the largest coins first (quarters)
  2. Count how many of each coin you need
  3. Make sure your total matches the amount needed
  4. Try different combinations!

Examples

Example 1: Make 50¢

Way 1: 2 quarters = 25¢ + 25¢ = 50¢

Way 2: 5 dimes = 10¢ + 10¢ + 10¢ + 10¢ + 10¢ = 50¢

Way 3: 1 quarter + 2 dimes + 1 nickel = 25¢ + 20¢ + 5¢ = 50¢

Example 2: Make 75¢

Way 1: 3 quarters = 25¢ + 25¢ + 25¢ = 75¢

Way 2: 2 quarters + 2 dimes + 1 nickel = 50¢ + 20¢ + 5¢ = 75¢

⚠️ Common Mistakes

  • Mixing up nickel (5¢) and dime (10¢) values
  • Forgetting that 4 quarters = $1.00 (100¢)
  • Not counting coins carefully - double check your work!

🌟 Tips & Tricks

  • Coin Values: Penny=1¢, Nickel=5¢, Dime=10¢, Quarter=25¢
  • Counting Trick: Count by 10s with dimes, by 5s with nickels
  • Always start with quarters when you can!

Practice Ideas

  • Use real coins to make different amounts
  • Play "store" with toys and practice making change
  • Try making 25¢, 50¢, and $1.00 in 3 different ways each

Practice problems

6 of the 100, worked through step by step — try them before opening the answer.

1 25 + 47 = ?

Hint: When adding two numbers, start with the ones place and then move to the tens place.

Show the answer

Answer: 72

  1. Write the numbers vertically in your mind, aligning the digits by place value (ones and tens). 25 + 47
  2. Add the digits in the ones column first. 5 (from 25) + 7 (from 47) = 12.
  3. Since 12 is a two-digit number, we separate it into 10 and 2. We write down the 2 in the ones place of the answer and carry over the 1 (which stands for 10) to the tens column.
  4. Now add the digits in the tens column, including the carry-over. 2 (from 25) + 4 (from 47) + 1 (carried over) = 7.
  5. Write the 7 in the tens place of the answer.
  6. Combine the tens and ones digits: 7 tens and 2 ones gives 72. Therefore, 25 + 47 = 72.

Let's add 25 and 47 step by step.

2 36 + 24 = ?

Hint: Add the tens first, then add the ones, and finally combine the two results.

Show the answer

Answer: 60

  1. Break the numbers into tens and ones: 36 is 30 + 6, and 24 is 20 + 4.
  2. Add the tens: 30 + 20 = 50.
  3. Add the ones: 6 + 4 = 10.
  4. Combine the results: 50 + 10 = 60.

The answer is 60.

3 36 + 48 = ?

Hint: Add the ones place first, then the tens place.

Show the answer

Answer: 84

  1. Add the numbers in the ones place: 6 + 8 = 14. Write down the 4 in the ones place and carry over the 1 to the tens place.
  2. Add the numbers in the tens place, including the carried-over 1: 1 + 3 + 4 = 8. Write down the 8 in the tens place.
  3. Combine the tens and ones: 80 + 4 = 84.

The answer is 84.

4 35 + 48 = ?

Hint: Add the ones place first, then the tens place

Show the answer

Answer: 83

  1. Add the ones place: 5 + 8 = 13. Write down 3 and carry over 1 to the tens place.
  2. Add the tens place: 3 + 4 + 1 (carried over) = 8.
  3. Combine the tens and ones: 80 + 3 = 83.

The answer is 83.

5 78 - 35 = ?

Hint: Think about subtracting the ones place first, then the tens place.

Show the answer

Answer: 43

  1. Start with 78.
  2. Subtract the ones place: 8 - 5 = 3.
  3. Subtract the tens place: 70 - 30 = 40.
  4. Combine the results: 40 + 3 = 43.

The answer is 43.

6 35 + 42 = ?

Hint: Add the ones place digits first, then the tens place digits.

Show the answer

Answer: 77

  1. Write the numbers vertically to align the place values. 35 + 42
  2. Add the digits in the ones place: 5 + 2 = 7. Write 7 in the ones place of the answer.
  3. Add the digits in the tens place: 3 + 4 = 7. Write 7 in the tens place of the answer.
  4. The final answer is 77.
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