Developing mathematical ideas : part 1, building a system of tens : DS21961.Lynn Grade 2, May that what she was doing represented the story in the problem, and that her result was the right answer. ... 195 So, why would I want to require someone to add the ones first and then the tens when they have no impulse to think of a number in terms of tens and ... My students have been solving word problems involving two-digit addition and subtraction both with and without regrouping.

Title | : | Number and Operations |

Author | : | Virginia Bastable, Susan Jo Russell |

Publisher | : | Dale Seymour Publication - 1999 |

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