math

1. Estimating Products

2. Terms
• Products – Answer to a multiplication
problem.
• Factors – The numbers multiplied to find a
product.
• Magnitude Estimate – An estimate to the
answer of a problem; it tells you whether
the answer is the tenths, ones, tens,
hundreds, thousands . . .

3. Steps
• Sample Problem: 14 x 17 = ?
• Round each of the factors so that there is
one number followed by zero(es).
Ex. 14 -> 10
x17 -> 20
• Solve the estimate to find the place value
of the product.
10 x 20 = 200; the answer is in the hundreds.

4. Additional Practice
1. 18 x 21
2. 27 x 6,245
3. 99 x 21
4. 22.6 x 28.9
1. 20 x 20 = 400
The answer is in the hundreds.
2. 30 x 6,000 = 180,000
The answer is in the hundred-thousands.
3. 100 x 20 = 2000
The answer is in the thousands
4. 20 x 30 = 600
The answer is in the hundreds

5. 568 187
x 27 x 56
1648 16
x 43 x 13
600
x 30
18,000
2000
x 40
80,000
200
x 60
12,000
20
x 10
200

6. Let’s try this together.
337 71 4381 634
x 13 x 13 x 41 x 12