N5.2
Analyze models of, develop strategies for, and carry out multiplication of whole numbers.

[C, CN, ME, PS, R, V]

Indicators for this outcome
(a)

Describe mental mathematics strategies used to determine multiplication facts to 81 (e.g., skip counting from a known fact, doubling, halving, 9s patterns, repeated doubling, or repeated halving).

(b)

Explain concretely, pictorially, or orally why multiplying by zero produces a product of zero.

(c)

Recall multiplication facts to 81 including within problem solving and calculations of larger products.

(d)

Generalize and apply strategies for multiplying two whole numbers when one factor is a multiple of 10, 100, or 1000.

(e)

Generalize and apply halving and doubling strategies to determine a product involving at least one two-digit factor.

(f)

Apply and explain the use of the distributive property to determine a product involving multiplying factors that are close to multiples of 10.

(g)

Model multiplying two 2-digit factors using an array, base ten blocks, or an area model, record the process symbolically, and describe the connections between the models and the symbolic recording.

(h)

Pose a problem which requires the multiplication of 2-digit numbers and explain the strategies used to multiply the numbers.

(i)

Illustrate, concretely, pictorially, and symbolically, the distributive property using expanded notation and partial products (e.g., 36 x 42 = (30 + 6) x (40 + 2) = 30 x 40 + 6 x 40 + 30 x 2 + 6 x 2).

(j)

Explain and justify strategies used when multiplying 2-digit numbers symbolically.

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