math IB MYP grade 7 - significant figures

What is the result of 4.56 x 2.8 rounded to three significant figures?

• 12.8
• 12.768
• 12.7
• 12.6

How many significant figures are in the number 0.000542?

• 5
• 3
• 2
• 4

Why are significant figures important in mathematical communication?

• To make calculations easier
• To make numbers look larger
• To convey the accuracy and precision of numerical data
• To make numbers look more precise

What is the relationship between significant figures and the accuracy of measuring instruments or known values?

• The more significant figures, the less accurate the instrument or value
• The more significant figures, the more accurate the instrument or value
• There is no relationship between significant figures and accuracy
• The fewer significant figures, the more accurate the instrument or value

When rounding a number ending with 5, what is the rule for rounding to the nearest significant figure?

• Round up to the next number
• Round down to the previous number
• Round to the nearest even number
• Round to the nearest odd number

What is the result of 12.345 + 0.26 rounded to two decimal places?

• 12.5
• 12.61
• 12.605
• 12.6

Which of the following is NOT a rule for identifying significant figures?

• Leading zeros are significant
• Trailing zeros are significant if there is a decimal point present
• Zeros between non-zero digits are significant
• All non-zero digits are significant

How do significant figures impact the accuracy and precision of numerical data?

• They make the data more precise
• They make the data less precise
• They make the data less accurate
• They make the data more accurate

What is the result of (5.67 + 4.2) x 3.51 rounded to three significant figures?

• 31.437
• 31.6
• 31.5
• 31.4

What are significant figures?

• Numbers that are divisible by 10
• Numbers that are larger than 1
• Digits that contribute to the precision of a number
• Numbers that are smaller than 1