Teaching with the Dual Board

Teaches place value; addition and subtraction of 2 digit numbers; regrouping; multiplication of 10, 9, 8, and 5.  It is often difficult to demonstrate to students the idea of regrouping. The structure of the Dual Board demonstrates easily that ten ones creates another ten – you physically run out of space for ones – and forces children to regroup them (or exchange them) for a ten-block.

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The Dual Board is used to teach:

The teacher holds the dual board with two ten-blocks and eight unit-blocks and asks the child, 'how far will this number reach in the track?' The child looks at the 1-100 track and responds, 'To 28.'

Building 2-Place Numbers in the
Dual Board

Children build a 2-place number, such as 28, by putting two 10- blocks and eight 1-blocks (single cubes) in the Dual Board. Then they measure the number by placing the blocks in the number track. This gives them both the cardinal and the ordinal aspects of numbers. The Dual Board helps children see the structure of 2-place numbers. The number track helps children see where numbers come in the number sequence.

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