Lesson 1.8

Estimate the sum by rounding to the nearest

hundred thousand.

214,312 + 572,849

• 300,000 + 600,000 =

  900,000

• 200,000 + 600,000 =

  800,000

• 200,000 + 500,000 =

  700,000

Estimate the sum by rounding to the nearest

hundred thousand.

214,312 + 572,849

• 300,000 + 600,000 =

  900,000

• 200,000 + 600,000 =

  800,000

• 200,000 + 500,000 =

  700,000

Estimate the sum by rounding to the nearest

thousand.

37,164 + 42,951

• 37,000 + 43,000 =

  80,000

• 38,000 + 43,000 =

  81,000

• 37,000 + 42,000 =

  79,000

Estimate the sum by rounding to the nearest

thousand.

37,164 + 42,951

• 37,000 + 43,000 =

  80,000

• 38,000 + 43,000 =

  81,000

• 37,000 + 42,000 =

  79,000

Estimate the sum by rounding to the nearest

ten thousand.

15,500 + 16,009

• 10,000 + 20,000 =

  30,000

• 20,000 + 30,000 =

  50,000

• 20,000 + 20,000 =

  40,000

Estimate the sum by rounding to the nearest

ten thousand.

15,500 + 16,009

• 10,000 + 20,000 =

  30,000

• 20,000 + 30,000 =

  50,000

• 20,000 + 20,000 =

  40,000

Estimate the difference by rounding to the

nearest thousand.

24,750–12,678=

• 25,000-13,000 = 12,000

• 24,000-13,000 = 11,000

• 25,000-14,000 = 13,000

Estimate the difference by rounding to the

nearest thousand.

24,750–12,678=

• 25,000-13,000 = 12,000

• 24,000-13,000 = 11,000

• 25,000-14,000 = 13,000

Estimate the difference by rounding to the

nearest hundred thousand.

734,120-203,459=

• 600,000-200,000

  =400,000

• 700,000-100,000

  =600,000

• 700,000-200,000

  =500,000

Estimate the difference by rounding to the

nearest ten thousand.

825,381-316,009=

• 830,000-220,000 =

  610,000

• 830,000-320,000 =

  510,000

• 730,000-320,000 =

  410,000