This video tutorial teaches grade 1 students how to perform subtraction within 100 without regrouping. It uses examples like 38 minus 24 and 69 minus 42 to demonstrate the process, emphasizing the importance of place value and using base ten blocks. The tutorial outlines the steps for subtracting big numbers, ensuring students understand the need to start with the ones place and then move to the tens place. The video concludes with a summary of the key points covered.

What is the main focus of this lesson?

• Multiplication within 100

• Subtraction without regrouping

• Division without regrouping

• Addition within 100

In the example 38 minus 24, how many tens blocks do we start with?

• Four tens blocks

• Three tens blocks

• Two tens blocks

• Five tens blocks

How many ones blocks are removed in the example 38 minus 24?

• Five ones blocks

• Four ones blocks

• Three ones blocks

• Two ones blocks

What is the result of 38 minus 24 using base ten blocks?

• 24

• 14

• 40

• 20

What is the first step in subtracting big numbers?

• Multiply the numbers

• Subtract the tens first

• Place the numbers in the correct place

• Add the numbers

In the subtraction of 38 minus 24, what is the result of subtracting the ones?

• 5

• 4

• 3

• 2

What is the result of subtracting the tens in 38 minus 24?

• 1

• 2

• 4

• 3

In the example 69 minus 42, what is the result of subtracting the ones?

• 5

• 8

• 7

• 6

What is the result of subtracting the tens in 69 minus 42?

• 3

• 2

• 4

• 1

What is the final answer for 69 minus 42?

• 27

• 28

• 26

• 25