In these lessons, we will learn how to multiply multi-digit numbers.
Multiplying Multi-Digit Numbers
Use patterns to multiply 10’s and 100’s.
Multiplying by 10, 100 and 1000
How to multiply whole numbers by 10, 100 and 1000?
We can multiply by breaking up the multiplier. We can use an array to show this.
Example, 3 × 12 can be viewed as 3 × 10 and 3 × 2.
How to multiply 2-digit by 2-digit numbers by breaking apart their arrays into easily manageable multipliers and finding partial products?
13 × 12
How to use the Area Array Model to simplify the multi-digit multiplication process?
54 × 18
Solve the following multiplication problem by estimating first, then modeling the problem using base ten blocks and record using expanded form, then multiply to show the number of hundreds first or by showing the ones place first.
You made 22 oatmeal cookies from one batch of mix. You make 3 batches of cookies. How many cookies did you make?
Step 1: Estimate First.
3 × 22 is about 3 × 20 = 60 cookies.
I predict that I will make a little more than 60 cookies.
Step 2: Use base ten blocks to represent your problem.
Step 3: Multiply showing the number of hundreds first or the number of ones first.
Step 4: Compare the final product in step 3 with your estimate in step 1.
Multiplying using Expanded Form
Multiplying using place value and expanded form with larger numbers to get products.
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