Mental Math Techniques for Multiplication

This video tutorial presents a series of math tricks to simplify calculations. It covers methods for multiplying by 11, 15, and 9, calculating 15% tips, multiplying two-digit numbers, squaring numbers ending in 5, and multiplying numbers ending in zero. Additionally, it provides techniques for adding large numbers by rounding them to multiples of ten. These tricks aim to make math easier and more intuitive, allowing for mental calculations and quicker problem-solving.

What is the result of multiplying 34 by 11 using the trick discussed?

• 384

• 374

• 344

• 374

How do you calculate 23 times 15 using the method described?

• Multiply by 10, then add 23

• Multiply by 10, then add half of 23

• Multiply by 10, then add half of 230

• Multiply by 15 directly

What is the first step in calculating a 15% tip on a $46 bill?

• Multiply by 10

• Divide by 100

• Multiply by 15

• Add 5

When multiplying two-digit numbers using the shortcut, what is the first step?

• Add the digits

• Multiply the first digits

• Multiply the last digits

• Crisscross multiply

How do you square a number ending in five using the trick provided?

• Add 25 to the product of the first digit and itself plus one

• Multiply the number by itself

• Add 50 to the number

• Multiply by 10 and add 5

What is the result of multiplying 60 by 7 using the method for numbers ending in zero?

• 480

• 420

• 600

• 360

What is the first step in multiplying a single-digit number by nine?

• Divide by two

• Multiply by ten

• Subtract one from the number

• Add one to the number

How do you simplify subtraction using mental math techniques?

• Multiply the numbers

• Subtract the smaller number from the larger

• Add the numbers together

• Round both numbers to the nearest ten

What is the result of multiplying 14 by 5 using the mental math trick?

• 70

• 75

• 65

• 60

What is the first step in the mental math technique for subtraction?

• Add to make a round number

• Subtract to make a round number

• Multiply by ten

• Divide by two