Fact Families

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Answer Key & Explanations

Fact Families · Grade 1 · Worksheet 2

1. Mason drew 8 stars on a piece of paper. He colored 3 of them yellow and the rest blue. How many stars did he color blue? Use the fact family of 3, 5, and 8 to help you. Answer: 5 Solution: The total number of stars is 8. The number of yellow stars is 3. To find the number of blue stars, subtract the yellow stars from the total: 8 - 3.
   Full step-by-step solution

   Step 1: The total number of stars is 8. The number of yellow stars is 3. Step 2: To find the number of blue stars, subtract the yellow stars from the total: 8 - 3. Step 3: 8 - 3 = 5. The answer is 5.

2. A square has 4 equal sides. If each side is 5 units long, what is the total distance around the square? Answer: 20 Solution: A square has 4 sides. All 4 sides are equal, and each one is 5 units long. To find the total distance around, add the lengths of all 4 sides: 5 + 5 + 5 + 5.
   Full step-by-step solution

   Step 1: A square has 4 sides. Step 2: All 4 sides are equal, and each one is 5 units long. Step 3: To find the total distance around, add the lengths of all 4 sides: 5 + 5 + 5 + 5. Step 4: 5 + 5 = 10, and 10 + 5 = 15, and 15 + 5 = 20. The total distance around the square is 20 units.

3. Noah has 6 toy dinosaurs. His friend Mia gives him 2 more toy dinosaurs. How many toy dinosaurs does Noah have now? Answer: 8 Solution: Noah starts with 6 toy dinosaurs. Mia gives him 2 more toy dinosaurs. Add the new dinosaurs to the ones he already has: 6 + 2 6 + 2 = 8 Noah has 8 toy dinosaurs now.
   Full step-by-step solution

   Step 1: Noah starts with 6 toy dinosaurs. Step 2: Mia gives him 2 more toy dinosaurs. Step 3: Add the new dinosaurs to the ones he already has: 6 + 2 Step 4: 6 + 2 = 8 Noah has 8 toy dinosaurs now.

4. Sarah has 2 red crayons and 1 blue crayons. How many crayons does Sarah have in all? Answer: 3 Solution: Count the red crayons: 2. Count the blue crayons: 1. Add them together: 2 + 1 = 3.
   Full step-by-step solution

   Step 1: Count the red crayons: 2. Step 2: Count the blue crayons: 1. Step 3: Add them together: 2 + 1 = 3. The answer is 3.

5. Matiu has 3 cookies. Matiu gives 2 cookies to a friend. How many cookies does Matiu have left? Answer: 1 Solution: Start with 3 cookies. Give away 2 cookies. Subtract: 3 - 2 = 1.
   Full step-by-step solution

   Step 1: Start with 3 cookies. Step 2: Give away 2 cookies. Step 3: Subtract: 3 - 2 = 1. The answer is 1.

6. Leo has 5 toy cars. Leo gets 2 more toy cars for their birthday. Now Leo has 7 toy cars in all. How many toy cars did Leo have before the birthday? Answer: 5 Solution: We know the total is 7 toy cars. Leo got 2 new toy cars. To find how many Leo had before, subtract the new ones: 7 - 2 = 5.
   Full step-by-step solution

   Step 1: We know the total is 7 toy cars. Step 2: Leo got 2 new toy cars. Step 3: To find how many Leo had before, subtract the new ones: 7 - 2 = 5. The answer is 5.

7. If 4 + 3 = 7, what is 7 - 4 = ? Answer: 3 Solution: We know from the problem that 4 + 3 = 7. This means 7 is the total, and it is made of the two parts 4 and 3. If we start with the total (7) and subtract one of the parts (4), we are left with the other part.
   Full step-by-step solution

   Step 1: We know from the problem that 4 + 3 = 7. Step 2: This means 7 is the total, and it is made of the two parts 4 and 3. Step 3: If we start with the total (7) and subtract one of the parts (4), we are left with the other part. Step 4: So, 7 - 4 = 3. The answer is 3.

8. There are 3 red apples and 4 green apples in a bowl. How many apples are there in total? Answer: 7 Solution: Identify the number of red apples. There are 3 red apples. Identify the number of green apples.
   Full step-by-step solution

   Step 1: Identify the number of red apples. There are 3 red apples. Step 2: Identify the number of green apples. There are 4 green apples. Step 3: Add the number of red apples and green apples together. 3 + 4 = 7 Step 4: State the total. Therefore, there are 7 apples in total.