Is it reasonable to think that 40,000 + 40,000 = 8,000?

Find the sum for 564, 892, 704, and 963.

Is it reasonable to say that 883 + 499 = 1,042

There are 893 students at Sharon, 1,369 students at Johns Creek, and 1,655 students at Daves Creek. What is the total number of students rounded to the nearest thousand, hundreds, and tens? Which answer is the closest to the exact answer?

How can you use a method different from standard algorithm (like break apart, compatible numbers, etc.) to add 262 + 399 + 172?

Mrs. H set a budget for Little T's 2nd birthday party for $600. If she spent $135 on making decorations, $119 on his birthday present, and $69 on party favors, how much would she have left for the food?

Solve the following problem. Fill in the blanks.

The Georgia Aquarium saw 100,000 people last week. If 76,893 people came on the weekend, how many people came during the weekdays?

Find the difference between 6,241 and 2,968.

Mrs. Holmes' class collected 5,678 pounds of recycling. Mrs. Altom's class collected 4,089 pounds. How many more pounds did Mrs. Holmes' class collect?

Find the difference for 9,004 and 398.

Mrs. Holmes' class collected 5,678 pounds of recycling. Mrs. Altom's class collected 4,089 pounds. If the goal was to collect 16,000 pounds, how many more pounds do they still need?

How can you use a method different from standard algorithm (like break apart, compatible numbers, etc.) to add 54 + 69 + 32?