Math 3 Reviewer

Estimate the sum or difference by rounding each number to the nearest hundred.

  579

+    214

• 600 + 200 = 800

• 570 + 210 = 780

• 500 + 200 = 700

Estimate the sum or difference by rounding each number to the nearest hundred.

  255 

-    189

• 300 - 200 = 100

• 250 - 100 = 150

• 260 - 200 = 60

Estimate the sum or difference by rounding each number to the nearest hundred.

    472 

+    148

• 470 + 100 = 570

• 400 + 100 = 500

• 500 + 100 = 600

Estimate the sum or difference by rounding each number to the nearest hundred.

  328 

-    207

• 300 - 200 = 100

• 230 - 200 = 30

• 320 - 200 = 120

Estimate the sum or difference by rounding each number to the nearest hundred.

  5 274 

-       465

• 5 270 - 460 = 4 810

• 5 000 - 400 = 4 600

• 5 300 - 500 = 4 800

Estimate the sum or difference by rounding each number to the nearest hundred.

  6 004 

-       529

• 6 000 - 500 = 5 500

• 6 000 - 520 = 5 480

• 6 000 - 600 = 5 400

Estimate the sum or difference by rounding each number to the nearest hundred.

  5 103 

-       464

• 5 100 - 500 = 4 600

• 5 100 - 400 = 4 700

• 5 100 - 460 = 4 640

Estimate the sum or difference by rounding each number to the nearest hundred.

  7 363 

+    3 293

• 7 400 - 3 300 = 4 100

• 7 000 - 3 000 = 4 000

• 7 300 - 3 200 = 4 100

Estimate the sum or difference by rounding each number to the nearest hundred.

    4 218 

-    1 996

• 4 200 - 1 900 = 2 300

• 4 200 - 2 000 = 2 200

• 4 210 - 1 900 = 2 310

Estimate the sum or difference by rounding each number to the nearest hundred.

  9 367 

-     8 378

• 9 400 - 8 400 = 1 000

• 9 370 - 8 300 = 1 070

• 9 000 - 8 000 = 1000