Math tool 12
Place Value
Build numbers with base ten blocks and place value disks, trade ten for one when a column fills up, shift decimals by multiplying and dividing by 10, and read big numbers on a place value mat.
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A column turns amber when it holds ten or more — trade ten pieces for one in the next column.
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Multiplying by 10 moves every digit one place to the left. The decimal point stays still.
Round to the nearest
Tap any digit to see its value.