Students solve problems that involve adding decimals.
Students solve problems that involve adding and subtracting decimals.
In this task, students use Van De Walle's concept of a "nice number" to round a number. This simply means to substitute a ?nice? number that is close so that some computation can be done more easily. The close number can be any nice number and need not be a multiple of ten or one hundred. It should be whatever makes the computation or estimation easier or simplifies numbers sufficiently in a story, chart, or conversation. The lesson begins on page 45 of the PDF file.
Students solve problems that involve subtracting decimals.