• Pre algebra
  • Decimal numbers
  • Decimal approximations

Decimal approximations

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  • Question 1:
    1 pts
    Is the following expression true or false? $$384.49 \approx 385$$
  • Question 2:
    1 pts
    Round $2.965$ to the nearest tenth. Use the number line.
    $2.8$
    $2.9$
    $3.0$
    $3.4$
  • Question 3:
    1 pts
    Round $4.2231$ to the nearest hundredth. Use the number line.
    $4.21$
    $4.22$
    $4.23$
    $4.24$
  • Question 4:
    1 pts
    Round $4.10354$ to the nearest thousandth. Use the number line.
    $4.102$
    $4.103$
    $4.104$
    $4.105$
  • Question 5:
    2 pts
    Express $1.3267$ to two decimal places.

    $1.31$

    $1.32$

    $1.33$

    $1.34$

  • Question 6:
    2 pts
    Express $0.4663817$ to three decimal places.

    $0.465$

    $0.466$

    $0.467$

    $0.468$

  • Question 7:
    2 pts
    The mass of a ship is stated as 37 659 tonnes to the nearest tonne. Are the following statements correct? The mass is greater than 37659.4 tonnes.
  • Question 8:
    2 pts
    The length of an envelope is $18 cm$ to the nearest $cm$. What is the smallest possible real length of the envelope?

    $16.5$

    $17.0$

    $17.5$

    $17.9$

  • Question 9:
    3 pts
    The interval on the number line below shows all the possible real lengths of the envelope (to the nearest $cm$). Write down the correct numbers for the lower and upper limits of the interval. represented on the diagram by A and B.
    $A=30.5; B=31.5$
    $A=30.4; B=31.4$
    $A=30.0; B=31.0$
    $A=30.1; B=31.1$
  • Question 10:
    3 pts
    Write the number 443.9591 correct to 5 significant figures.

    $443.95$

    $443.96$

    $443.60$

    $443.90$

  • Question 11:
    3 pts
    The length of a paper is $18.5 cm$ to the nearest tenth of a $cm.$ The interval on the number line below shows all the possible real lengths of the paper. Write down the numbers represented on the number line by A, B and C.
    $A=18.45; B=18.5; C=19.0$
    $A=18.0; B=18.5; C=19.0$
    $A=18.49; B=18.5; C=18.51$
    $A=18.45; B=18.5; C=18.55$