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Ok so it is really easy but ill explain how and why

You round any thing 5 or more up to the next digit and anything 4 or less round to the same just add 0's instead so take 56+34 56 rounds to 50 and 34 rounds to 30 so 50+30=80

Q: How can estimating help you add two digit numbers?

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It is easier to simply add two one-digit numbers than to mess about with estimation!

they all are digit numbers

From right to left.

To make the list of two-digit numbers with digits that add up to 10, first write the pairs of single-digit integers that add up to 10. They are (1,9), (2,8), (3,7), (4,6), (5,5). Then recognize that each of these pairs of numbers, except 5, can be combined in two different ways to make two-digit numbers that satisfy the problem. 19 and 91 28 and 82 37 and 73 46 and 64 55 So there are nine two-digit numbers with digits that add up to 10.

No.

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Idont know

It is easier to simply add two one-digit numbers than to mess about with estimation!

they all are digit numbers

You line up the last numbers and then add it!

To multiply two digit numbers, multiply each place value of a factor by each place value digit and add the results.

Add the two greatest possible four digit numbers. 9999 + 9999

To divide a single digit number by a double digit number,you first have to understand its obviously isn't easy. The following should help: *Put a zero on the area of the quotient and add a decimal point next to it. * After doing this,divide as if both numbers were two digit numbers and proceed You should get the answer.

21

From right to left.

To make the list of two-digit numbers with digits that add up to 10, first write the pairs of single-digit integers that add up to 10. They are (1,9), (2,8), (3,7), (4,6), (5,5). Then recognize that each of these pairs of numbers, except 5, can be combined in two different ways to make two-digit numbers that satisfy the problem. 19 and 91 28 and 82 37 and 73 46 and 64 55 So there are nine two-digit numbers with digits that add up to 10.

No. There's no two digit numbers that could do this. The largest two digit number is 99. If you add 99 to itself, you only get 198, which is much smaller than a four digit number.

No.