From these, you can deduce that A equals 1 ... "A + B × 2 = ?" While it seems simple, the order of operations throws many off. Solving this requires a careful understanding of how multiplication ...

This is a memorization quiz of the full extended multiplication table up to 20 × 20, Tiers I thru IV. Thus time intentionally set low; 16:00 allows 2.4 secs per exercise. If you know the answers by ...

This is a memorization quiz of multiplication beyond the 15 × 15 table, up to 18 × 18 with some overlap of the lower tier. Thus time intentionally set low. If you know the answers by heart, there's ...