Estimation and Computation

Use front-end rounding to estimate the difference of:
7166 - 2998

• 10 000

• 5000

• 7000

• 4000

Estimate to find which two numbers have a sum of ABOUT 10 000

• 800 + 3950

• 8010 + 1627 

• 8243 + 3000

• 8847 + 200 

Estimate to find which two numbers have a difference of ABOUT 4000

• 80 916 - 59 978

• 10 832 - 2041

• 92 439 - 81 899

• 25 263 - 21 090

Use front-end rounding to estimate the sum of:
590 322 + 473 990

• 1 000 000

• 600 000

• 100 000

• 900 000

Zaniah scored 358 points more than Layla on a video game. Layla scored 1,274 points. Which is the best estimate of the number of points Zaniah scored?

• 1,610

• 1,620

• 1,630

• 1,640

Norfolk, has a population of 242,628 people.

Baltimore, has 376,865 more people than Norfolk.

Charleston, has 496,804 less people than Baltimore.

Round to the nearest hundred thousand to calculate an estimate.

Mathematical Equivalence

ON

Tags

CCSS.4.NBT.A.3

There are 293 steps to the top of the Leaning Tower of Pisa in Italy.  To the nearest hundred, about how many steps are there?

• 200

• 300

• 290

• 250

Tags

CCSS.3.NBT.A.1

CCSS.4.NBT.A.3

reasoning to determine an approximate value

• dividend

• factor

• strip diagram

• estimation

Eddy spend $15.45 on a shirt, $21.99 on a pair of pants, and $12.15 on a hat. Which is the best estimate for the amount of money in dollars Eddy spent? (a)  

• $40

• $50

• $70

• $60

Collin has 247 marbles and 5 jars.  If each jar has about the same number of marbles, what is the best estimate of the number of marbles in each jar?

• 25 marbles

• 48 marbles 

• 50 marbles 

• 60