Money Combinations

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Answer Key & Explanations

Money Combinations · Grade 2 · Worksheet 3

1. 72 - 29 = ? Answer: 43 Solution: Write the problem vertically: 72 - 29 Look at the ones column: 2 - 9. Since 2 is smaller than 9, we need to regroup. Take 1 ten from the 7 tens, leaving 6 tens.
   Full step-by-step solution

   Step 1: Write the problem vertically: 72 - 29 Step 2: Look at the ones column: 2 - 9. Since 2 is smaller than 9, we need to regroup. Step 3: Take 1 ten from the 7 tens, leaving 6 tens. Add that 1 ten (which is 10 ones) to the 2 ones, making 12 ones. Step 4: Now subtract the ones: 12 - 9 = 3 Step 5: Subtract the tens: 6 - 2 = 4 Step 6: Combine the results: 4 tens and 3 ones = 43 The answer is 43.

2. 72 - 39 = ? Answer: 33 Solution: Look at the ones place: 2 - 9. Since 2 is smaller than 9, we need to regroup from the tens place. Take 1 ten from the 7 tens, which leaves 6 tens.
   Full step-by-step solution

   Step 1: Look at the ones place: 2 - 9. Since 2 is smaller than 9, we need to regroup from the tens place. Step 2: Take 1 ten from the 7 tens, which leaves 6 tens. Add that 1 ten (which is 10 ones) to the 2 ones, making 12 ones. Step 3: Now subtract the ones: 12 - 9 = 3. Step 4: Now subtract the tens: 6 - 3 = 3. Step 5: Combine the results: 3 tens and 3 ones = 33. The answer is 33.

3. A rectangular garden is divided into 5 equal rows. Each row has 8 tomato plants. How many tomato plants are there in total? Answer: 40 Solution: There are 5 rows in the garden. Each row has 8 tomato plants. To find the total number of plants, multiply the number of rows by the number of plants in each row: 5 × 8.
   Full step-by-step solution

   Step 1: There are 5 rows in the garden. Step 2: Each row has 8 tomato plants. Step 3: To find the total number of plants, multiply the number of rows by the number of plants in each row: 5 × 8. Step 4: 5 × 8 = 40. The answer is 40.

4. 3 dimes + 1 nickel + 1 penny = ? Answer: 36¢ Solution: 3 dimes = 10 + 10 + 10 = 30 cents. Add the nickel: 30 + 5 = 35 cents. Add the penny: 35 + 1 = 36 cents.
   Full step-by-step solution

   Step 1: 3 dimes = 10 + 10 + 10 = 30 cents. Step 2: Add the nickel: 30 + 5 = 35 cents. Step 3: Add the penny: 35 + 1 = 36 cents. The answer is 36¢.

5. Mason has 2 dimes and 7 pennies in his pocket. How many cents does Mason have in total? Answer: 27 Solution: A dime is worth 10 cents. Mason has 2 dimes. 2 × 10 = 20 cents.
   Full step-by-step solution

   Step 1: A dime is worth 10 cents. Mason has 2 dimes. 2 × 10 = 20 cents. Step 2: A penny is worth 1 cent. Mason has 7 pennies. 7 × 1 = 7 cents. Step 3: Add the values together: 20 cents + 7 cents = 27 cents. The answer is 27 cents.

6. 36 + 28 = ? Answer: 64 Solution: Add the ones place: 6 + 8 = 14. Write down 4 in the ones place and carry over 1 to the tens place. Add the tens place: 3 + 2 + 1 (carried over) = 6.
   Full step-by-step solution

   Step 1: Add the ones place: 6 + 8 = 14. Write down 4 in the ones place and carry over 1 to the tens place. Step 2: Add the tens place: 3 + 2 + 1 (carried over) = 6. Write down 6 in the tens place. Step 3: Combine the tens and ones: 60 + 4 = 64. The answer is 64.

7. Emma has 3 quarters and 2 dimes in her piggy bank. How much money does Emma have in total? Answer: 95 Solution: Each quarter is worth 25 cents. Emma has 3 quarters, so 3 × 25 = 75 cents. Each dime is worth 10 cents.
   Full step-by-step solution

   Step 1: Each quarter is worth 25 cents. Emma has 3 quarters, so 3 × 25 = 75 cents. Step 2: Each dime is worth 10 cents. Emma has 2 dimes, so 2 × 10 = 20 cents. Step 3: Add the values together: 75 cents + 20 cents = 95 cents. Emma has 95 cents in total.

8. 52 + 38 = ? Answer: 90 Solution: Add the ones digits: 2 + 8 = 10. Write down 0 in the ones place and carry over 1 to the tens column. Add the tens digits including the carry-over: 5 + 3 + 1 = 9.
   Full step-by-step solution

   Step 1: Add the ones digits: 2 + 8 = 10. Write down 0 in the ones place and carry over 1 to the tens column. Step 2: Add the tens digits including the carry-over: 5 + 3 + 1 = 9. Write down 9 in the tens place. Step 3: Combine the tens and ones: 90. The answer is 90.

9. Mere has 6 dimes and 8 nickels in her wallet. How many cents does Mere have in total? Answer: 100 Solution: A dime is worth 10 cents. Mere has 6 dimes. 6 × 10 = 60 cents.
   Full step-by-step solution

   Step 1: A dime is worth 10 cents. Mere has 6 dimes. 6 × 10 = 60 cents. Step 2: A nickel is worth 5 cents. Mere has 8 nickels. 8 × 5 = 40 cents. Step 3: Add the values together: 60 cents + 40 cents = 100 cents. The answer is 100 cents.

10. Emma is saving money to buy a book that costs 75 cents. She has 3 quarters and 2 dimes in her piggy bank. How much money does Emma have saved so far? Answer: 95 Solution: - Each quarter is worth 25 cents - Each dime is worth 10 cents Emma has 3 quarters: 25 + 25 + 25 = 75 cents Emma has 2 dimes: 10 + 10 = 20 cents 75 cents (from quarters) + 20 cents (from dimes) = 95 cents Emma has 95 cents saved so far.
    Full step-by-step solution

    Step 1: Identify the value of each coin type - Each quarter is worth 25 cents - Each dime is worth 10 cents Step 2: Calculate the total value of quarters Emma has 3 quarters: 25 + 25 + 25 = 75 cents Step 3: Calculate the total value of dimes Emma has 2 dimes: 10 + 10 = 20 cents Step 4: Add all the money together 75 cents (from quarters) + 20 cents (from dimes) = 95 cents Emma has 95 cents saved so far.