Transcript Estimating Products - Iroquois Central School District

Estimating Products
SRB 225-228
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 . . .
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.
Additional Practice
1.
18 x 21
1.
20 x 20 = 400
2.
7 x 6,245
2. 10 x 6,000 = 60,000
The answer is in the hundreds.
The answer is in the ten-thousands.
3.
99 x 2
3. 100 x 1 = 100
4.
22.6 x 28.9
4. 20 x 30 = 600
The answer is in the hundreds
The answer is in thehundreds