Approximation and Estimation

Round off 345.678 to 1 decimal place.

• 345.6

• 345.8

• 345.67

• 345.7

Round off 123.456 to the nearest whole number.

• 124

• 120

• 123

• 125

Round off 6.7894 to 3 significant figures.

• 6.78

• 6.80

• 6.75

• 6.79

Identify the significant digits in the number 0.00456.

• 564

• 645

• 456

• 546

State the number of significant figures for the number 0.9872.

• 3

• 4

• 5

• 6

State the number of significant figures for the number 80900.

• 3

• 3 or 4

• 3 or 4 or 5

• 5

The scores of eight students in a test are 85, 88, 93, 92, 90, 89, 92 and 70. Estimate the average score of the eight students.

• 87.375

• 86.5

• 87.5

• 88

• 21.5

• 255

• 223

• 21.6

State the place value of the digit 6 in 103.617.

• ones

• tenths

• hundredths

• thousandths