2.1-2.5 Review

Use mental math to solve: 3,999+312

• 4,311

• 4,310

• 4,312

• 3,311

An adult seal weighs 6,600 pounds and its pup weighs 3,847 pounds. What is their combined weight? Use mental math OR the standard algorithm to solve.

• 10,440

• 9,446

• 10,447

• 385

Estimate the sum by rounding to the nearest THOUSANDS: 5,232 + 2,611

• 7,800

• 7,000

• 7,843

• 8,000

Elle says, "When rounding to the nearest thousand, 928,674 rounds to 930,000." Do you agree? Explain.

• Yes, 928,674 rounded to the nearest thousand is 930,000.

• No, Elle rounded to the nearest ten thousand.

• No, Elle rounded to the nearest hundred thousand.

Estimate the difference by rounding to the nearest THOUSANDS place: 9,668-2,489

• 9,000

• 8,000

• 10,000

• 9,500

Find the sum: 358+277

Find the sum: 148+157

Find the sum: 7,118+4,295

Allie writes a blog. 29,604 people read her first post. The next week, 47,684 read her second post. What is the total number of readers?

Find the difference: 358-172