Pizzas And Things Count groups of two to 6 Use equipment to
model and add sets of twos. Devise and use problem solving
strategies (draw a picture, use equipment, guess and check, be
systematic). This is a simple problem about doubling and
halving. These are important basic skills as they can be used to
estimate numbers of objects and some students use them as the
basis for their own non-standard number algorithms. Doubling is
the first step towards finding any multiple of a number and
halving is the beginning of work with fractions. At this stage
it is useful to use the two things together as they are inverse
operations. This means that one operation will cancel out the
other. If students can operate comfortably with inverses then
they have a really good understanding of the process involved.
Hence it is useful, where possible, to develop the operation and
it’s inverse, side by side. Other examples of inverse operations
are multiplying by four and finding quarters. A lot of
mathematics is based around inverse