Breaking Apart 2-Digit Numbers for Subtraction

This video tutorial, Lesson 5.2, focuses on breaking apart two-digit numbers to perform subtraction using mental math. It begins with an introduction to the concept and provides several examples, such as subtracting 18 from 35, 15 from 31, 13 from 42, and 19 from 47. The tutorial also includes real-world problems involving oranges and cookies to illustrate the application of subtraction in everyday scenarios. Additionally, it guides viewers on deciding when to add or subtract in different situations. The lesson concludes with a summary and a preview of the next topic, which is modeling regrouping for subtraction.

What is the first number in a subtraction problem called?

• Subtrahend

• Minuend

• Difference

• Addend

If you have 35 and subtract 18 by breaking it into 10 and 8, what is the final result?

• 20

• 18

• 15

• 17

When subtracting 15 from 31 by breaking 15 into 10 and 5, what is the result?

• 14

• 17

• 15

• 16

Subtracting 13 from 42 by breaking apart the 13 results in what difference?

• 28

• 29

• 30

• 31

How many oranges did Mr. Lee sell if he had 64 and then 49?

• 16

• 14

• 15

• 13

What is the difference in the number of cookies on the first and second trays?

• 16

• 19

• 17

• 18

To find out how many students are on the bus after 14 more get on, should you add or subtract?

• Add

• Subtract

• Multiply

• Divide

After 14 students get off the bus, how do you determine how many are left?

• Division

• Multiplication

• Subtraction

• Addition

What is the result of 43 minus 14 using the breaking apart method?

• 30

• 27

• 28

• 29

In subtraction, what is the term for the number that is being subtracted?

• Subtrahend

• Product

• Difference

• Minuend