1. Identify the leftmost digit of each number.
2. Add these leftmost digits together to get an estimated sum.
3. Ignore the other digits in the numbers.

• The leftmost digits are 3 and 2.
• Adding these gives an estimated sum of 5.
• Ignore the other digits, so the estimated sum is 5000.

1. Identify the leftmost digit of each number.
2. Subtract the smaller leftmost digit from the larger one to get an estimated difference.
3. Ignore the other digits in the numbers.

• The leftmost digits are 7 and 3.
• Subtracting 3 from 7 gives an estimated difference of 4.
• Ignore the other digits, so the estimated difference is 4000.

1. Estimate the sum of 4826 and 3194.
2. Estimate the difference between 5963 and 2289.

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