Unit 3 Lesson 15

Front

What is estimation?

Back

Estimation is a way of finding an approximate value or number, rather than an exact one. It helps us make quick calculations.

Front

How do you round a number to the nearest hundred?

Back

To round a number to the nearest hundred, look at the tens digit. If it is 5 or more, round up. If it is 4 or less, round down.

Front

What is a number line?

Back

A number line is a straight line with numbers placed at equal intervals. It helps us visualize numbers and their relationships.

Front

If Tina estimates the library is 0 miles away and Tanya estimates it is 10 miles away, what is the difference in their estimates?

Back

The difference in their estimates is 10 miles.

Front

What is multiplication?

Back

Multiplication is a mathematical operation where you add a number to itself a certain number of times. For example, 3 times 4 means adding 3 four times (3 + 3 + 3 + 3).

Front

How many sticks of gum does Juan have if he buys 6 packs with 10 sticks each?

Back

Juan has 60 sticks of gum (6 packs x 10 sticks = 60 sticks).

Front

What does it mean to estimate distance?

Back

Estimating distance means making a guess about how far away something is, without measuring it exactly.

Front

What is the nearest hundred to 314?

Back

The nearest hundred to 314 is 300.

Front

What is the purpose of using a number line?

Back

A number line helps us understand the order of numbers, compare them, and perform operations like addition and subtraction.

Front

If Tina estimates the beach is 200 miles away and Tanya estimates it is 240 miles away, what is the average of their estimates?

Back

The average of their estimates is 220 miles (200 + 240 = 440; 440 ÷ 2 = 220).