Within factors from 0 through 10, the learner knows the products of , from 0 through 20, and interprets each fact as two equal groups of , an array with two rows, or doubling ; increasing by 1 increases the product by 2. This fluency supports related division-by-2 facts and efficient multiplication within 100, but does not include multi-digit multiplication or generalized algebraic treatment.
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To find a fact with , think double the other number. This means making two equal groups.
You can also count by 2 six times:
Therefore, . The related division fact is .
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These adaptive units introduce, teach, or reinforce this skill (Recall multiplication facts for 2) through scaffolded problems that grow in difficulty as concepts are understood.