Benchmark Subtraction Techniques

The video tutorial explains how to use benchmarks in subtraction. It demonstrates the process with examples, showing how to subtract numbers by using benchmarks like 1000, 10,000, and 30,000. The method involves adjusting the numbers to make subtraction easier and then adding back the adjustment to get the final result.

What is a benchmark number in subtraction?

• A number that is difficult to subtract from

• A number that is always odd

• A number that is easy to subtract from

• A number that is always even

Why is 99 considered close to a benchmark?

• Because it is a prime number

• Because it is one less than 100

• Because it is an even number

• Because it is a multiple of 10

How does using a benchmark help in subtraction?

• It has no effect on subtraction

• It makes the subtraction process more complex

• It simplifies the subtraction process

• It makes the subtraction process longer

In the example of 1,000 minus 213, what is the first step?

• Add 1 to 213

• Subtract 1 from 1,000

• Subtract 213 directly from 1,000

• Add 213 to 1,000

What is the result of 1,000 minus 213 using the benchmark method?

• 787

• 850

• 800

• 900

What is the benchmark number used in the example of 1,000 minus 213?

• 1,000

• 213

• 10,000

• 100

In the example of 10,000 minus 8,417, what is the first step?

• Subtract 1 from 10,000

• Add 1 to 8,417

• Subtract 8,417 directly from 10,000

• Add 8,417 to 10,000

What is the result of 10,000 minus 8,417 using the benchmark method?

• 1,700

• 1,500

• 1,600

• 1,583

What is the benchmark number used in the example of 10,000 minus 8,417?

• 100

• 1,000

• 10,000

• 8,417

In the example of 30,000 minus 16,400, what is the first step?

• Subtract 1 from 30,000

• Add 1 to 16,400

• Add 16,400 to 30,000

• Subtract 16,400 directly from 30,000