Math Shortcuts and Techniques

The video introduces four math tricks to save time: multiplying by 11, squaring numbers ending in 5, multiplying by 4, and subtracting from 1000. Each trick is explained with examples, demonstrating how to simplify calculations using these methods.

Which of the following is NOT one of the math shortcuts introduced in the video?

• Multiplying by 11

• Subtracting from 1000

• Squaring numbers ending in 5

• Dividing by 3

Tags

CCSS.4.NBT.B.5

What is the middle digit when multiplying 11 by 32?

• 7

• 3

• 2

• 5

Tags

CCSS.4.NBT.B.5

When multiplying 11 by 56, what is the final result?

• 616

• 611

• 561

• 651

What is the first step in squaring a number ending in 5, such as 35?

• Subtract 5 from the number

• Add 5 to the number

• Multiply the last digit by itself

• Multiply the first digit by itself plus one

Tags

CCSS.6.EE.A.1

What is the result of 45 squared using the shortcut method?

• 2020

• 2025

• 1825

• 2250

Tags

CCSS.3.OA.A.1

What is the alternative method for multiplying a number by 4?

• Multiply by 5 and subtract 1

• Multiply by 2 and add 2

• Multiply by 2 twice

• Multiply by 3 and add 1

Tags

CCSS.4.NBT.B.5

What is the result of 57 times 4 using the shortcut method?

• 232

• 214

• 228

• 224

What is the first step in subtracting a number from 1000 using the shortcut method?

• Subtract each digit from 9

• Subtract each digit from 10

• Add each digit to 9

• Add each digit to 10

What is the result of 1000 minus 386 using the shortcut method?

• 614

• 614

• 614

• 614

What is the result of 1000 minus 491 using the shortcut method?

• 519

• 501

• 491

• 509