Texas Math Models

Try “number line” or “4.5D”

Ten times right, one tenth left

4.2A and 3.2B

34,502 G3–4

the chart is built on one rule, and it runs both ways× 10 each step to the left1,000100101÷ 10 each step to the right100 is ten 10s; 10 is one tenth of 100× 10 each step to the left1010.10.01÷ 10 each step to the rightthe rule does not stop at the onesthe same chart runs from the billions down to the hundredths

How this one works

How

step left and the place is worth ten times more; step right and it is one tenth.

Best when

you forget which way the places grow.

seen one of these on a test? See it on a real question: TEKS 4.2B, what each digit is worth.

The same problem, other ways