Adding Whole Numbers and Estimation

The video tutorial teaches how to add whole numbers by aligning them according to place value. It provides two examples: one with smaller numbers and another with larger numbers up to the 10,000s place. The tutorial emphasizes the importance of starting from the rightmost digit and moving left, and it demonstrates how to carry over numbers when necessary. Estimation is used to check the reasonableness of answers. The video concludes with practice problems for students to solve on their own.

Why is it important to keep numbers aligned when adding?

• To ensure correct addition of corresponding place values

• To avoid using a calculator

• To make the numbers look neat

• To make it easier to subtract later

When adding whole numbers, where do you start?

• From the middle digit

• From the rightmost digit

• From any digit

• From the leftmost digit

What do you do if the sum of the digits in a column is greater than 9?

• Write the sum as it is

• Carry over the extra value to the next column

• Ignore the extra value

• Subtract 10 from the sum

How do you handle a sum of 12 in the tens column?

• Write 1 in the tens place and 2 in the hundreds place

• Carry over 1 to the hundreds place and write 2 in the tens place

• Ignore the 2

• Write 12 in the tens place

What is the purpose of carrying over in addition?

• To make the sum larger

• To ensure each column has only one digit

• To make the sum smaller

• To avoid using a calculator

What is the sum of 1 + 5 + 6 in the hundreds place in the first example?

• 12

• 11

• 13

• 10

What is the purpose of estimating the sum after adding?

• To make the sum larger

• To find the exact sum

• To make the sum smaller

• To check if the sum is reasonable

In the first example, what is the estimated sum of 2582 and 3647?

• 5000

• 6000

• 8000

• 7000

What is the sum of 6 and 4 in the ones place in the second example?

• 8

• 9

• 10

• 11

How do you verify your addition using estimation?

• By rounding each number to the nearest thousand

• By rounding each number to the greatest place value

• By rounding each number to the nearest hundred

• By rounding each number to the nearest ten