Estimate Sums and Differences

Front

What is estimating in math?

Back

Estimating is finding a number that is close enough to the right answer, often by rounding numbers.

Front

How do you round to the nearest thousand?

Back

Look at the hundreds place. If it's 5 or more, round up. If it's 4 or less, round down.

Tags

CCSS.3.NBT.A.1

CCSS.4.NBT.A.3

Front

Estimate the difference of 7,900 - 2,999 by rounding to the nearest thousand.

Back

5,000

Front

What is the best estimate of the number of people who stayed if 926 people were at a tournament and 607 left?

Back

300

Front

How do you round to the nearest hundred?

Back

Look at the tens place. If it's 5 or more, round up. If it's 4 or less, round down.

Tags

CCSS.3.NBT.A.1

CCSS.4.NBT.A.3

Front

Estimate the sum of 120 + 190 by rounding to the nearest hundred.

Back

300

Front

Estimate the sum of 327 + 431 by rounding to the nearest hundred.

Back

700

Front

Estimate the sum of 56 + 79.

Back

140

Front

What is the purpose of estimating sums and differences?

Back

To quickly find an approximate answer without calculating the exact value.

Front

What does it mean to find the difference in math?

Back

Finding the difference means subtracting one number from another.

Tags

CCSS.5.NBT.B.7