Adding Two-Digit Numbers

The video tutorial explains how to add 45 and 9 using place value. It starts by introducing the math sentence and the importance of placing numbers correctly in columns. The tutorial then demonstrates the addition process, emphasizing starting with the ones place. It concludes by verifying the result using a visual diagram, ensuring the understanding of the addition process and the correct answer of 54.

Why is it important to place the number 9 in the ones column instead of the tens column when adding 45 + 9?

• To ensure the number 9 is not mistakenly valued as 90

• To simplify subtraction

• To make the addition process faster

• To avoid using a calculator

What is the first step in adding 45 and 9?

• Subtract 9 from 45

• Multiply the numbers

• Add the ones column first

• Add the tens column first

After adding 5 and 9 in the ones column, what should you do next?

• Multiply the result by 2

• Subtract 1 from the tens column

• Carry over 1 to the tens column

• Write 14 in the ones column

What is the final answer when you add 45 and 9?

• 64

• 49

• 54

• 59

How can you visually verify the result of 45 + 9?

• By counting and converting ones into a ten

• By subtracting 9 from 54

• By drawing a number line

• By using a calculator