Estimate the difference:
$H T O 6 4 0 - 4 2 0$

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Solution

Step 1: Subtract the ones
Given : $H T O 6 4 0 - 4 2 0$
First subtract ones $0 - 0 = 0$ ,
Write $0$ under ones column
Step 2: Subtract the tens
Next subtract tens $4 - 2 = 2$ ,
Write $2$ under tens column
Step 3: subtract the hundreds
Next subtract hundreds $6 - 4 = 2$ ,
Write $2$ under hundreds column
So we get,
$H T O 6 4 0 - 4 2 0 2 2 0$
Hence, the required solution is $220$

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