Subtract Multiples of 10

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Answer Key & Explanations

Subtract Multiples of 10 · Grade 1 · Worksheet 2

1. 80 - 40 = ? Answer: 40 Solution: Start with 80, which is 8 tens. Subtract 40, which is 4 tens. 8 tens minus 4 tens equals 4 tens.
   Full step-by-step solution

   Step 1: Start with 80, which is 8 tens. Step 2: Subtract 40, which is 4 tens. Step 3: 8 tens minus 4 tens equals 4 tens. Step 4: 4 tens is 40. The answer is 40.

2. Liam had 80 crayons in his art box. He gave 30 crayons to his friend Emma. How many crayons does Liam have now? Answer: 50 Solution: 1. Liam starts with 80 crayons in his art box. This is the total number of crayons he has at the beginning.
   Full step-by-step solution

   Let's go step by step. 1. Liam starts with 80 crayons in his art box. This is the total number of crayons he has at the beginning. 2. He gives 30 crayons to Emma. Giving crayons away means he has fewer crayons than before. So we need to subtract the crayons he gave away from the crayons he had at the start. 3. Write the subtraction: 80 − 30 = ? 4. Calculate: 80 − 30 = 50 5. So, Liam now has 50 crayons left. Final answer: 50

3. Matiu had 90 stickers. Then Matiu gave 30 stickers to a friend. How many stickers does Matiu have now? Answer: 60 Solution: Start with 90 stickers. Subtract the 30 stickers given away: 90 - 30 = 60. Matiu has 60 stickers now.
   Full step-by-step solution

   Step 1: Start with 90 stickers. Step 2: Subtract the 30 stickers given away: 90 - 30 = 60. Matiu has 60 stickers now.

4. A farmer has 7 rows of corn with 10 corn plants in each row. If 3 rows of corn are harvested, how many corn plants are left in the field? Answer: 40 Solution: Find the total number of corn plants initially. The farmer has 7 rows, each with 10 corn plants. Total plants = 7 × 10 = 70.
   Full step-by-step solution

   Let's go step by step. Step 1: Find the total number of corn plants initially. The farmer has 7 rows, each with 10 corn plants. Total plants = 7 × 10 = 70. Step 2: Determine how many rows are harvested. The problem says 3 rows are harvested. Each harvested row had 10 plants, so plants harvested = 3 × 10 = 30. Step 3: Subtract the harvested plants from the total. Plants left = 70 − 30 = 40. Step 4: Conclusion. After harvesting 3 rows, there are 40 corn plants remaining in the field.

5. Charlotte had 80 stickers. Then Charlotte gave 60 stickers to a friend. How many stickers does Charlotte have now? Answer: 20 Solution: Start with 80 stickers. Subtract the 60 stickers given away: 80 - 60 = 20. Charlotte has 20 stickers now.
   Full step-by-step solution

   Step 1: Start with 80 stickers. Step 2: Subtract the 60 stickers given away: 80 - 60 = 20. Charlotte has 20 stickers now.

6. Liam collected 80 stickers in his sticker book. He gave 30 stickers to his friend Noah. How many stickers does Liam have left? Answer: 50 Solution: Liam started with 80 stickers. He gave 30 stickers to Noah, which means he has fewer stickers now. To find out how many he has left, subtract the number he gave away from the number he started with.
   Full step-by-step solution

   Liam started with 80 stickers. He gave 30 stickers to Noah, which means he has fewer stickers now. To find out how many he has left, subtract the number he gave away from the number he started with. Step 1: Start with the total number of stickers: 80 Step 2: Subtract the stickers given away: 80 - 30 Step 3: Calculate: 80 - 30 = 50 So, Liam has 50 stickers left.

7. Anna is collecting toy cars. Anna has 40 toy cars. Anna gives 10 toy cars to Anna's younger sibling. How many toy cars does Anna have left? Answer: 30 Solution: Anna starts with 40 toy cars. Take away the 10 cars given to the sibling: 40 - 10 = 30. Anna has 30 toy cars left.
   Full step-by-step solution

   Step 1: Anna starts with 40 toy cars. Step 2: Take away the 10 cars given to the sibling: 40 - 10 = 30. Anna has 30 toy cars left.

8. 20 - 20 = ? Answer: 0 Solution: 20 - 20 = 0. Subtract the tens: 2 - 2 = 0.
9. Lucas has 80 crayons in a box. Lucas takes out 60 crayons to color a picture. How many crayons are left in the box? Answer: 20 Solution: Start with 80 crayons in the box. Remove 60 crayons: 80 - 60 = 20. There are 20 crayons left in the box.
   Full step-by-step solution

   Step 1: Start with 80 crayons in the box. Step 2: Remove 60 crayons: 80 - 60 = 20. There are 20 crayons left in the box.

10. Charlotte saw 50 birds sitting on a fence. Then 50 birds flew away. How many birds are still sitting on the fence? Answer: 0 Solution: There were 50 birds on the fence. 50 birds flew away, so subtract: 50 - 50 = 0. There are 0 birds left on the fence.
    Full step-by-step solution

    Step 1: There were 50 birds on the fence. Step 2: 50 birds flew away, so subtract: 50 - 50 = 0. There are 0 birds left on the fence.