8.1 Make reasonable guess of number of objects in a group: Answer questions like “Is it closer to ___ or to ___?”

8.2 Use benchmark numbers to estimate before counting: 10, 25, 50, 100.

8.3 Use rounding-off to the nearest tens to estimate solutions to computations: answer will be close to, bigger than, smaller than.

8.4 Use rounding-off to the nearest hundreds to estimate solutions to computations.

8.5 Estimate size of fraction: is about the same as, is smaller than, is bigger than.

8.6 Round-off decimals to the nearest tenth.

8.8 Use appropriate rounding-off to record solutions to problems: level of accuracy.