Solving Systems Sums Differences

Estimate the difference of 470-289 by rounding to the nearest hundreds

• 300

• 100

• 181

• 200

• 700 - 200 = 500
• 800 - 200 = 600
• 800 - 300 = 500
• 700 - 200 = 500

• 500 - 200 = 300
• 600 - 200 = 300
• 600 - 200 = 400
• 500 - 200 = 200

• 400 + 200 = 600
• 500 + 200 = 700
• 500 - 200 = 400
• 500 - 200 = 300

• 900 - 300 = 600
• 900 - 200 = 700
• 1,000 - 200 = 800
• 900 + 300 = 1,200

Round to the nearest thousand, then estimate the difference:

98,412 - 45,802

• 53,000

• 51,000

• 52,000

• 51,872

Round to the nearest hundred, then estimate the difference:

642 − 137

• 600

• 780

• 500

• 510

• 400 + 200 = 600
• 500 + 200 = 600
• 500 + 200 = 700
• 400 + 200 = 700

• 400 + 100 = 500
• 400 + 200 = 600
• 400 + 200 = 500
• 300 + 100 = 400

300 - 100 = 400

200 - 100 = 100

300 - 100 = 200

300 + 100 = 400

• 300 - 100 = 400

• 200 - 100 = 100

• 300 - 100 = 200

• 300 + 100 = 400