Worksheet 3: Addition and Subtraction (within 100, no regrouping) Name: Date: Part A: Compute 1. 42+25= 2. 78-34= 3. 50+40= 4. 99-19= Part B: Solve the Equation 5. 20+ x = 65 → x = 6. x-10=50 → x = Part C: One-Step Word Problem 7. A library has 45 books. The school buys 23 more. How many books are there in total? Part D: Two-Step Word Problem

Worksheet 3: Addition and Subtraction (within 100, no regrouping)

Part A: Compute

1. \( 42 + 25 = 67 \)


2. \( 78 - 34 = 44 \)


3. \( 50 + 40 = 90 \)


4. \( 99 - 19 = 80 \)

Part B: Solve the Equation

1. \( 20 + x = 65 \) → \( x = 65 - 20 \) → \( x = 45 \)


2. \( x - 10 = 50 \) → \( x = 50 + 10 \) → \( x = 60 \)

Part C: One-Step Word Problem

1. A library has 45 books. The school buys 23 more. How many books are there in total?
   

   Solution: \( 45 + 23 = 68 \) books.

   
   

   Ответ: 68 книг.

   
   

Part D: Two-Step Word Problem

(No question provided for Part D in the image.)