Determining the relative abundance of two different molecular species or the absolute number of molecules in a single sample is challenging. We describe an absolute counting method that can use ...

Journal for Research in Mathematics Education, Vol. 14, No. 1 (Jan., 1983), pp. 47-57 (11 pages) An analysis of the transition from counting-all to counting-on identified three subskills: (a) counting ...

Adding using number bonds Adding three numbers - problem-solving Adding three small numbers by counting on Addition strategies - largest number first See all clips from Adding Three Numbers (5) ...

Miss James teaches you the valuable "counting on" strategy to help you solve tricky addition problems.

Karen C. Fuson, Adrienne M. Fuson, Instruction Supporting Children's Counting on for Addition and Counting up for Subtraction, Journal for Research in Mathematics Education, Vol. 23, No. 1 (Jan., 1992 ...