Rounding and Estimating Decimals and Whole Numbers

This video tutorial covers the concept of rounding numbers, including both whole numbers and decimals. It explains the basic rule of rounding: 'five and above, give a shove; four and below, let it go.' The tutorial provides examples of rounding whole numbers and decimals, demonstrating how to apply the rule. It also discusses the use of rounding for estimation, highlighting its importance in simplifying complex calculations and checking the accuracy of solutions. The video emphasizes the purpose of estimation in problem-solving, helping students to approximate answers and verify their calculations.

What is the rule for rounding numbers?

• Six and above, give a shove; three and below, let it go

• Five and above, give a shove; four and below, let it go

• Four and above, give a shove; five and below, let it go

• Three and above, give a shove; six and below, let it go

If you have the number 16 and you need to round it, what will it become?

• 10

• 20

• 15

• 16

When rounding the number 56.1 to the nearest whole number, what is the result?

• 56.5

• 56

• 57

• 55

What does the number 758.000 become when rounded to the nearest hundredth?

• 758.10

• 758.01

• 758.76

• 758.00

What is 79 rounded to the nearest tens place?

• 70

• 80

• 79

• 75

What is 32 rounded to the nearest tens place?

• 32

• 30

• 35

• 40

Why is estimating useful when solving problems?

• It makes the problem more complex

• It provides an approximate answer to compare with the actual answer

• It always gives the exact answer

• It helps to avoid solving the problem

When should you use estimation?

• When you want an exact answer

• When you want to make the problem more difficult

• When you want to avoid solving the problem

• When you want to get an approximate answer before solving the problem

What should you do if your actual answer is far from your estimated answer?

• Ignore the estimated answer

• Rework and check your calculations

• Assume the estimated answer is wrong

• Change the problem

What is the first step in verifying your estimated answer?

• Solve the problem without estimating

• Estimate the answer first

• Ignore the problem

• Change the numbers in the problem