Topic 4 enVision Practice Test

Front

What is rounding in mathematics?

Back

Rounding is the process of adjusting the digits of a number to make it simpler and easier to work with, typically by increasing or decreasing it to the nearest specified place value.

Front

How do you estimate the product of two numbers using rounding?

Back

To estimate the product, round each number to a convenient value, then multiply the rounded numbers.

Front

What is the formula for finding the total number of items when given the number of groups and items per group?

Back

Total = Number of groups x Items per group.

Front

How can you estimate the total number of tissues in 4 boxes if each box contains 174 tissues?

Back

Round 174 to 200, then calculate 4 x 200 = 800 as an estimate.

Front

What is the average in a set of numbers?

Back

The average is the sum of all values divided by the number of values.

Front

How do you estimate the total number of students in a school with 5 grades averaging 48 students each?

Back

Round 48 to 50, then calculate 5 x 50 = 250 as an estimate.

Front

What is multiplication and how is it related to repeated addition?

Back

Multiplication is a mathematical operation that represents the total of adding a number to itself a certain number of times. For example, 4 x 100 is the same as 100 + 100 + 100 + 100.

Front

How do you calculate the total time spent on an activity over several days?

Back

Multiply the time spent per day by the number of days. For example, if Ali ran for 19 minutes for 7 days, the total is 19 x 7 = 133 minutes.

Front

What is the significance of the number of weeks in a year for age estimation?

Back

There are 52 weeks in a year, so to estimate age in weeks, multiply the age in years by 52.

Front

How do you estimate the number of weeks someone has been alive if they are 9 years old?

Back

Multiply 9 years by 52 weeks/year to estimate approximately 468 weeks.