Mastering Mental Math Techniques for Arithmetic

This video tutorial focuses on mental math techniques for performing basic arithmetic operations such as addition, subtraction, multiplication, and division. It provides step-by-step examples for adding two-digit and three-digit numbers, subtracting numbers using breakdown methods, multiplying numbers by breaking them into smaller parts, and dividing numbers using simple division tricks. The tutorial emphasizes understanding the underlying concepts to perform calculations mentally and efficiently.

How would you mentally add 34 and 58?

• By adding 30 and 50, then adding 4 and 8, and finally combining the results.

• By adding 34 and 50, then adding 8.

• By adding 30 and 58, then adding 4.

• By adding 34 and 8, then adding 50.

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CCSS.2.NBT.B.7

What is the result of adding 69 and 45 using mental math?

• 124

• 134

• 114

• 104

Tags

CCSS.2.NBT.B.6

How do you handle negative results in mental subtraction?

• Apply the negative sign to both numbers being subtracted.

• Only apply the negative sign to the larger number.

• Subtract the smaller number from the larger number.

• Ignore the negative sign.

Tags

CCSS.7.NS.A.1C

What is the result of subtracting 75 from 38 using mental math?

• 37

• 47

• 57

• 67

Tags

CCSS.7.NS.A.1C

How can you mentally multiply 5 times 4?

• By adding 4 five times.

• By adding 5 four times.

• By adding 5 and 4.

• By subtracting 4 from 5.

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CCSS.3.OA.A.1

What is the result of multiplying 25 by 7 using mental math?

• 170

• 175

• 160

• 150

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CCSS.4.NBT.B.5

How would you mentally divide 324 by 2?

• By dividing 324 by 3.

• By dividing 324 by 4.

• By dividing 32 by 4 and then 4 by 2.

• By dividing 32 by 2 and then 4 by 2.

Tags

CCSS.4.NBT.B.6

What is the result of dividing 168 by 4 using mental math?

• 40

• 42

• 44

• 46

Tags

CCSS.4.NBT.B.6

How do you break down 156 for division by 4?

• 100, 40, and 16

• 150 and 6

• 140 and 16

• 120 and 36

Tags

CCSS.4.NBT.B.6

CCSS.5.NBT.B.6

What is the result of dividing 84 by 7 using mental math?

• 11

• 13

• 12

• 10

Tags

CCSS.4.NBT.B.6