ESTIMATE THE PRODUCT BY GENERAL RULE 19 MULTIPLIED BY 33 AND 176 MULTIPLIED BY 45 . PLEASE ANSWER
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"7 times 8 is 56." Write 6, carry 5.
"7 times 2 is 14, plus 5 is 19." Write 9, carry 1.
"7 times 6 is 42, plus 1 is 43." Write 43.
That is,
7 × 628 = 4396.
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