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Multiplying 2-Digit by 2-Digit Numbers
Transcript of Multiplying 2-Digit by 2-Digit Numbers
Multiplying 2-Digit by 2-Digit Numbers *We learned yesterday that we can either use:
Long multiplication or multiplication with regrouping
*Today you are going to use both methods to multiply two digits by two digits. How do you multiply by two digit numbers? Sammy's Car wash had 38 full service car washes in one day. If each full service costs 12 dollars, how much money did Sammy's Car Wash make in one day from full-service car washes? Example Word Problem What operation are we going to use to find the answer to this question? What numbers do we need to multiply to solve this problem?
What do they represent? Vocabulary
Partial Products 38, represents the number of full-service washes
$12, represents the cost for one full-service wash Will the solution be the number of car washes or an amount of money? Multiply by the ones.
2 x 8 ones = 16 ones
Regroup the ones as 1 ten and 6 ones.
2 x 3 tens = 6 tens
6 tens + 1 ten = 7 tens Step 1 Multiply by the tens.
10 x 8 ones = ones or 8 tens
10 x 3 tens = 30 tens and 3 hundreds Step 2 Add the partial products.
+ 380----partial product
Sammy's car was made $456.00
Step 3 Why do you add the partial products in Step 3?