Unit Review

Front

What is expanded form in mathematics?

Back

Expanded form is a way of writing numbers that breaks them down into the sum of each digit multiplied by its place value. For example, 50,370 can be written as (5 x 10,000) + (3 x 100) + (7 x 10).

Front

How do you calculate the total number of students in multiple grades?

Back

To find the total number of students, add the number of students in each grade together. For example, if there are 112 in 2nd grade, 88 in 4th grade, and 97 in 5th grade, the total is 112 + 88 + 97 = 297.

Front

What does it mean for a number to be greater than or less than another number?

Back

A number is greater than another if it is to the right on the number line, meaning it has a higher value. Conversely, a number is less than another if it is to the left on the number line, meaning it has a lower value.

Front

How do you estimate the sum of two lengths?

Back

To estimate the sum of two lengths, round each length to the nearest ten or hundred and then add the rounded numbers. For example, 53 cm can be rounded to 50 cm and 98 cm to 100 cm, giving an estimated total of 150 cm.

Front

What is the significance of place value in a number?

Back

Place value determines the value of a digit based on its position in a number. For example, in the number 50,370, the digit '5' is in the ten-thousands place, making it worth 50,000.

Front

How can you determine if a number fits a specific range?

Back

To determine if a number fits a specific range, check if it is greater than the lower limit and less than the upper limit. For example, to see if 7,709 fits between 6,829 and 9,131, check if 6,829 < 7,709 < 9,131.

Front

What is a practical application of multiplication in real life?

Back

Multiplication can be used to determine total quantities when one quantity is a multiple of another, such as calculating the total number of toys Eli has if he has 4 times the amount of toys as Emma.

Front

What is the process for solving a word problem involving addition?

Back

Read the problem carefully, identify the quantities involved, and then perform the addition of those quantities to find the total.

Front

How do you identify the hundreds place in a number?

Back

The hundreds place is the third digit from the right in a whole number. For example, in the number 7,709, the digit '7' is in the hundreds place.

Front

What is the importance of rounding in estimation?

Back

Rounding simplifies numbers to make calculations easier and quicker, especially when an exact answer is not necessary.