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Can you bring it back to mind?
Try to answer before you turn the card. Recalling is part of learning.
Divisibility and integer structure · NEW
18 pens and 30 pads: greatest number of identical complete kits?
Say it aloud, write it down, or picture an example.
Space it out, don’t cram it in.
Known cards return in 1, 3, 7, 14, then 30 days. “Again” brings a card back in 10 minutes. This simple schedule is stored only on this device.