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Mental Math Strategies

Grade 2 · Mathematics · Worksheet 3

  1. 48 + 26 = ? Answer: ______________
  2. A square has sides that are each 7 centimeters long. What is the perimeter of the square?
    Answer: ______________
  3. A rectangular classroom has desks arranged in 7 rows with 8 desks in each row. How many desks are there in total?
    Answer: ______________
  4. Ethan had 58 toy cars. Ethan gave 14 cars to a friend. How many toy cars does Ethan have now? Answer: ______________
  5. Oliver has 17 stickers. Oliver's mom gives Oliver 29 more stickers. How many stickers does Oliver have now? Answer: ______________
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Answer Key & Explanations

Mental Math Strategies · Grade 2 · Worksheet 3

  1. 48 + 26 = ? Answer: 74 Solution: Start with 48 + 26 Break 26 into 2 + 24 to make adding easier Add 48 + 2 = 50 Add 50 + 24 = 74 The answer is 74.
    Full step-by-step solution

    Step 1: Start with 48 + 26 Step 2: Break 26 into 2 + 24 to make adding easier Step 3: Add 48 + 2 = 50 Step 4: Add 50 + 24 = 74 The answer is 74.

  2. A square has sides that are each 7 centimeters long. What is the perimeter of the square? Answer: 28 Solution: A square has 4 sides that are all the same length. Each side is 7 centimeters long. To find the perimeter, add up the lengths of all 4 sides: 7 + 7 + 7 + 7.
    Full step-by-step solution

    Step 1: A square has 4 sides that are all the same length. Step 2: Each side is 7 centimeters long. Step 3: To find the perimeter, add up the lengths of all 4 sides: 7 + 7 + 7 + 7. Step 4: 7 + 7 = 14, and 14 + 7 = 21, and 21 + 7 = 28. The perimeter of the square is 28 centimeters.

  3. A rectangular classroom has desks arranged in 7 rows with 8 desks in each row. How many desks are there in total? Answer: 56 Solution: There are 7 rows of desks Each row has 8 desks To find the total, multiply the number of rows by the number of desks in each row: 7 × 8 7 × 8 = 56 The answer is 56.
    Full step-by-step solution

    Step 1: There are 7 rows of desks Step 2: Each row has 8 desks Step 3: To find the total, multiply the number of rows by the number of desks in each row: 7 × 8 Step 4: 7 × 8 = 56 The answer is 56.

  4. Ethan had 58 toy cars. Ethan gave 14 cars to a friend. How many toy cars does Ethan have now? Answer: 44 Solution: Start with 58 toy cars. Subtract 14 cars that were given away: 58 - 14 = 44.
    Full step-by-step solution

    Step 1: Start with 58 toy cars. Step 2: Subtract 14 cars that were given away: 58 - 14 = 44. The answer is 44.

  5. Oliver has 17 stickers. Oliver's mom gives Oliver 29 more stickers. How many stickers does Oliver have now? Answer: 46 Solution: Start with 17 stickers. Add 29 more stickers: 17 + 29 = 46.
    Full step-by-step solution

    Step 1: Start with 17 stickers. Step 2: Add 29 more stickers: 17 + 29 = 46. The answer is 46.