Dividing Review SWBAT use division to find quotients; use divisibility rules to predict remainders; estimate quotients; divide whole numbers in thousand.

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Presentation transcript:

Dividing Review SWBAT use division to find quotients; use divisibility rules to predict remainders; estimate quotients; divide whole numbers in thousand by 2 and 3 digit numbers; divide decimals by powers of 10; write scientific notation for decimals

Label the divisor, dividend, quotient and remainder: ___53 R 1 ___53 R 1 36) ) Remainder Dividend Divisor Quotient

Division Steps Estimate – using rounding determine approximately what the answer should be. Estimate – using rounding determine approximately what the answer should be. Divide – Determine how many times the divisor can go into the dividend. Divide – Determine how many times the divisor can go into the dividend. Multiply – Multiply the number you determined by the divisor Multiply – Multiply the number you determined by the divisor Subtract – Subtract the product you came up with in the last step from the front of the dividend. Subtract – Subtract the product you came up with in the last step from the front of the dividend. Bring down the next number and repeat the steps. Bring down the next number and repeat the steps.

Divisibility Rules A number is divisible by 2 if it is even. A number is divisible by 2 if it is even. A number is divisible by 3 if the sum of its digits are divisible by 3. A number is divisible by 3 if the sum of its digits are divisible by 3. A number is divisible by 5 if it ends in five or zero. A number is divisible by 5 if it ends in five or zero. A number is divisible by 6 if it is divisible by two and three. A number is divisible by 6 if it is divisible by two and three. A number is divisible by 9 if the sum of its digits are divisible by 9. A number is divisible by 9 if the sum of its digits are divisible by 9.

Answers 81,993 ÷ 3 = 27,331 81,993 ÷ 3 = 27,331 84,174 ÷ 6 = 14,029 84,174 ÷ 6 = 14, ,138 ÷ 9 = 92,904 R2 836,138 ÷ 9 = 92,904 R ÷ 52 = 127 R ÷ 52 = 127 R34 72,072 ÷ 72 = ,072 ÷ 72 = ÷ 40 = 51 R ÷ 40 = 51 R20

Dividing by powers of 10 Recall: What happened to a number when we multiplied by 10? Recall: What happened to a number when we multiplied by 10? What is the inverse or opposite operation of multiplication? What is the inverse or opposite operation of multiplication? What do you think happens when we divide by 10? What do you think happens when we divide by 10?

Answers 0.02 ÷ 10 = ÷ 10 = ÷ 10= ÷ 10= ÷ 10 = ÷ 10 = ÷ 10 = ÷ 10 = 1.995