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Mathematics
Number Play
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Count to 20: add, take away, combine and split number cards and objects; the numeral, the number word and the ten frame always show the same total. Includes a Lab and a counting and quick-look Game.
Number word: zero
Ten frame with 0 dots
Object
Arrangement
Model notes
- Amounts are whole numbers from 0 to 10 (Ten) or to 20 (Twenty). Number cards, objects, the ten frame, the numeral and the number word always show the same total; changing one place adds or removes items in the others.
- Cards combine only without regrouping: the two ones digits add up to at most 10 (7 and 3 make 10, 10 and 2 make 12; 7 and 5 do not combine). This is a rule of the resource for practising composing and decomposing, not a limit of addition.
- Dragging the top edge of a tens card splits off 10; of a ones card, 1. Tidy up breaks everything into 1 cards and lines them up five to a row, like a ten frame.
- New objects and cards go to a random free spot at least 60 scene units apart while there is room. The oranges, fish, flowers and balls are only for counting; their size has no meaning.
- Reading aloud uses the browser's built-in voice. Without a matching voice the read-aloud button is hidden; the numeral and the word are still there. Pronunciation depends on the device.
- Game: numbers are random within the level and never repeat three times in a row. A star is earned only for a right answer on the first try and is never taken away. A quick-look picture shows for the chosen time (0.1–2 s) and then hides.
- The Lab allows 20 cards per number, 10 cards per sign, 10 ten frames, 20 objects of each kind and 1 cards totalling 20. The Lab gives no score and does not check equations.