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Here are some tips for Estimated Subtraction, which aligns with Arizona state standards:
Estimated Subtraction
For this topic, you need to know how to round numbers.
To review the Rounding Numbers topic, see here.
Also, to review Estimated Addition, see here.
Example:
363627 - 54564 Estimate Step 1: Identify which place value you need to round to.
Round to the largest place value of the number with the fewest digits.363627 has 6 digits and 54564 has 5 digits.
54564 has fewer digits and its largest place value is the ten-thousands.Step 2: Round the numbers to the correct place value found in Step 1.
We're rounding to the nearest ten-thousands.363627 rounds to 360000.
54564 rounds to 50000.Step 3: Subtract the rounded numbers to get the estimated difference.
360000 + 50000 310000
The answer is
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