Solving problems with rational numbers in decimal form

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.