How to play
Your child looks at a glass jar of marbles and makes a guess: more or less than 10, about 10, 20 or 30, or which of two jars holds more. Every guess is welcome. The jar then pours out into trays of ten, and your child counts by tens and on with ones to find the real number, building a feel for quantity and place value. Levels grow from more or less than 10 to comparing jars and estimating up to about 50. There are no timers and no losing: closer guesses earn shinier "good guesser" badges, and a wrong count just gets a gentle hint to look at the trays again.
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