Rounding & Estimation (Cambridge International IGCSE Maths): Exam Questions

Write $1.8796$ correct to 4 significant figures.

Write 0.046875 correct to 2 significant figures.

Write the number 0.076499 correct to 2 significant figures.

Write 0.047883 correct to 2 significant figures.

Write 1.8972 correct to 2 decimal places.

Write 209 802 correct to the nearest thousand.

Write 4123 correct to 3 significant figures.

Write 57.3997 correct to 4 significant figures.

Calculate $\sqrt{2.38+6.4^{2}}$, writing down your full calculator display.

Extract:

Calculate ![square root of 2.38 plus 6.4 squared end root], writing down your full calculator display.

Write your answer to part (a) correct to 4 decimal places.

Write the number 10 100 correct to 2 significant figures.

Calculate.

$\frac{16.379-0.879}{4.2}\times1.241$

Give your answer correct to 2 significant figures.

$T=\frac{49.2-9.50}{4.085\times2.35}$

By writing each number correct to 1 significant figure, work out an estimate for $T$. You must show all your working.

i) 29 parcels each have a value of $68. By writing each of these numbers correct to 1 significant figure, find an estimate for the total value of these 29 parcels.

$ .................................................. [1]

ii) Without doing any calculation, complete this statement.

The actual total value of these 29 parcels is less than the answer to part (i)

because ...................... [1]