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9×GooGooCalc⌕

Mean, Median, Mode & Range

Mean, median and mode from one sorted list — plus the range, which measures spread rather than average.

Numbers

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Grades 3–5

Rounding on a Number Line

“Five or more, round up” is a picture before it is a rule. Here is the picture.

Grades 2–4

Place Value & Expanded Form

The same digit is worth a different amount depending on where it sits.

Grades 4–6

Roman Numerals

Built one letter at a time, with the subtractive pairs like IV and CM explained as they appear.

Grades 3–5

Estimating

Round first, work it out in your head, then check the real answer is close.