Mental Math Subtraction Techniques

This video from MooMooMath and Science introduces mental math techniques for performing subtraction in your head. It covers two main methods: rounding numbers to simplify subtraction and using a counting change approach. The video demonstrates these techniques with three example problems, including larger numbers, to help viewers understand and apply these methods effectively. The video concludes with a reminder to subscribe for daily math and science content.

What is the main focus of the video?

• Mental math subtraction

• Multiplication techniques

• Division strategies

• Addition shortcuts

Tags

CCSS.7.EE.B.3

In the first example, what number is added to both 88 and 47 to make subtraction easier?

• 3

• 4

• 2

• 5

Tags

CCSS.2.NBT.B.7

CCSS.3.NBT.A.2

What is the result of 91 minus 50 in the first example?

• 39

• 45

• 43

• 41

Tags

CCSS.7.NS.A.1C

In the second example, what number is 28 rounded to?

• 35

• 30

• 25

• 40

Tags

CCSS.3.NBT.A.1

CCSS.4.NBT.A.3

What is the result of 76 minus 30 in the second example?

• 48

• 50

• 46

• 44

Tags

CCSS.2.NBT.B.7

CCSS.3.NBT.A.2

In the third example, what number is added to both 168 and 47?

• 2

• 3

• 4

• 5

Tags

CCSS.3.OA.D.8

What is the final result of 171 minus 50 in the third example?

• 125

• 123

• 119

• 121

Tags

CCSS.2.NBT.B.7

CCSS.3.NBT.A.2

Which technique involves thinking about what needs to be added to reach the target number?

• Division strategy

• Multiplication method

• Counting change back

• Rounding technique

Tags

CCSS.4.NBT.B.6

What is the purpose of rounding numbers in mental math subtraction?

• To increase accuracy

• To make numbers larger

• To simplify subtraction

• To complicate calculations

What is the main benefit of using mental math techniques for subtraction?

• Faster calculations

• More complex problems

• Increased errors

• Longer computation time

Tags

CCSS.2.NBT.B.5