Solving problems with rational numbers in decimal form

Examples
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Lessons
  1. Estimate and calculate
    1. -2.42 + (-6.53)
    2. -0.37 - (-4.61)
    3. 7.36 - 3.41
    4. 1.47 + (-5.92)
  2. Estimate and calculate.
    1. -4.75 ÷ 1.9
    2. 2.5 × (-6.4)
    3. -8.6 ÷ (-1.3)
    4. -3.3 × (-3.3)
  3. In a winter day, the temperature at 9:00 a. m. is -5.7 °C and 3.8 °C at 2:00 p.m. Find:
    1. the change in temperature.
    2. average rate of change in temperature.