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Use the following steps to multiply mentally by 50.

Example:

74 × 50 =

Divide 74 by 2. 74 ÷ 2 = 37. (remainder = 0)

Since the remainder is 0, write 00 after 37.

74 × 50 = 3700.

147 × 50 =

Divide 147 by 2. 147 ÷ 2 = 73 (remainder = 1)

Since the remainder is 1, write 50 after 73.

147 × 50 = 7350.