• Pre algebra
  • Decimal numbers
  • Multiplying and dividing decimals

Multiplying and dividing decimals

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  • Question 1:
    1 pts
    Multiply by 10 and the number will move one place value to the left.
  • Question 2:
    1 pts
    Multiply: $$\begin{array}{r cccc} & 0. & 3 \\ \times & & 7 \\ \hline \end{array}$$

    $0.21$

    $21.0$

    $2.1$

    $20.1$

  • Question 3:
    1 pts
    Divide: $$0.49\div 0.7$$

    $7$

    $0.7$

    $0.07$

    $7.07$

  • Question 4:
    1 pts
    Is the following expression truo or false? $$146.6\div 3.2=14.66\div 32$$
  • Question 5:
    2 pts
    Is the following expression true or false? $$\begin{array}{r ccccc} & 0. & 0& 0 & 4& 5 \\ \times & & & & & 9 \\ \hline & & &4. & 0& 5 \end{array}$$
  • Question 6:
    2 pts
    Which expression is represented on the picture?
    $3 \times 3$
    $10 \times 10$
    $3.3 \times 3.3$
    $0. 3 \times 0.3$
  • Question 7:
    2 pts
    Which expression is equivalent to $6\cdot (z+0.0016).$

    $z+0.0096$

    $6z+0.096$

    $6z+0.0096$

    $6z+0.96$

  • Question 8:
    2 pts
    Evaluate: $$2.84\times 3\times 100$$

    $852.0$

    $85.20$

    $8.520$

    $0.852$

  • Question 9:
    3 pts
    You bought a skirt for 24 euros on the hypermarket. How much would that be in $ \$ $ if $\unicode{0x20AC} \,1.5 = \$ 1?$ Which expression can be used to find it?

    $24 + 1.5$

    $24 \cdot 1.5$

    $24\div 1.5$

    $24 -1.5$

  • Question 10:
    3 pts
    A jacket was $25 \% $ off. The sale price was $\$36.$ What expression can be used to find the original price?
    $ \$36\div 9 =\$4.\quad \$ 4\cdot 4=\$16$
    $ \$36 \div 3=\$12.\quad \$12\cdot 4=\$48$
    $ \$36 \div 2=\$18.\quad\$ 18\cdot 4=\$72$
    $ \$36 \div 12=\$3.\quad \$ 3\cdot 4=\$12$
  • Question 11:
    3 pts
    The large rectangle dimensions are three times the dimensions of the small rectangles. How many times greater is the area of the larger rectangle compared to the area of the smaller one?
    $2 \times$
    $3 \times$
    $6 \times$
    $9 \times$
  • Question 12:
    3 pts
    One inch is equivalent to 2.54 centimeters. How many inches are there in 50.8 centimeters?

    $10$

    $20$

    $30$

    $40$