Adding and Subtracting Whole Numbers in GoMath 4th Grade

The video tutorial covers lessons 1.6 and 1.7, focusing on adding and subtracting whole numbers. It emphasizes the importance of estimation before solving problems. The tutorial provides detailed steps for rounding numbers to estimate sums and differences, and explains the process of addition and subtraction, including borrowing in subtraction. The video also includes examples of both simple and complex problems, ensuring students understand the concepts of place value and regrouping.

Why is it important to estimate sums and differences before solving problems?

• To practice rounding skills

• To ensure the final answer is in the correct range

• To avoid using a calculator

• To make the problem easier to solve

When rounding the number 397 to the nearest hundred, what is the result?

• 300

• 350

• 400

• 390

What is the sum of 397 and 285 after rounding both numbers to the nearest hundred?

• 500

• 800

• 700

• 600

In the problem 397 + 285, what is the actual sum?

• 702

• 692

• 682

• 672

When rounding 800,000 and 20,923 to the nearest ten thousand, what are the rounded numbers?

• 800,000 and 30,000

• 900,000 and 20,000

• 800,000 and 20,000

• 810,000 and 21,000

What is the estimated sum of 870,000 and 20,000?

• 880,000

• 890,000

• 900,000

• 910,000

What is the first step when borrowing in subtraction?

• Borrow from the next place value

• Subtract the smaller digit from the larger digit

• Round the numbers

• Add the digits together

In the problem 302 - 189, what is the estimated difference after rounding?

• 400

• 200

• 100

• 300

What is the actual difference of 302 - 189?

• 133

• 123

• 143

• 113

When checking subtraction with addition, what should the sum of the parts equal?

• The estimate

• The larger number

• The difference

• The smaller number