Place Value

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This webquest is part of a larger unit exploring numbers and operations in Base Ten.

1.NBT 2. Understand that the two digits of a two digits number represent amounts of tens and ones.  Understand the following as special cases: (a.) 10 can be thought of as a bundle of ten ones - called a "ten". (b.) The numbers from 11 to 1 are composed of a ten and one, two, three, four, five, six, seven, eight, or nine ones. (c.) The numbers 10, 20, 30, 40, 50, 60, 70, 80, 90 refer to one, two, three, four, five, six, seven, eight, or nine tens (and zero ones).

1.NBT.4. Add with in 100, including adding a two-digit number and a one-digit number, and adding a two digit number and a multiple of 10, using concrete models, or drawings and strategies based on place value, properties of operations and/or the relationship between addition and subtraction: relate the strategy to a written method and explain the reasoning used.  Understand that is adding two-digits numbers, one adds tens and tens, ones and ones; and sometimes it is necessary to compose a ten.

Students have had opportunites in class to experiment with Base Ten concepts in different ways.

During class, students have already constructed bean sticks which represent a ten.  Using tongue depressors and 10 beans per stick, students used these sticks to model numbers.  Loose beans were used for 'ones' value.

Coffee stirrers have been used to bundle for ten by rubber bands.

Base Ten blocks have been used to represent numbers. 


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