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An infinite amount if you add, subtract or divide them. 3 pairs if you multiply them.
One rule for finding number pairs that add to 100 is to start with one number and subtract it from 100 to find the other number. For example, if one number is 75, subtracting it from 100 gives 25, so the pair is (75, 25).
You can either just add them up or use quick logic to add them in pairs: All the numbers from 1 to 49 match up with 51 through 99 to = 49 pairs of 100 = 4900, than add the two you skipped 4900 + 50 + 100 = 5050 total
Infinitely many.
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100 + 099 + 198 + 297 + 3...52 + 4851 + 49This list has 50 members. If you don't like that zero in (100+0), then there are only 49 pairs.
51
An infinite amount if you add, subtract or divide them. 3 pairs if you multiply them.
One rule for finding number pairs that add to 100 is to start with one number and subtract it from 100 to find the other number. For example, if one number is 75, subtracting it from 100 gives 25, so the pair is (75, 25).
You can either just add them up or use quick logic to add them in pairs: All the numbers from 1 to 49 match up with 51 through 99 to = 49 pairs of 100 = 4900, than add the two you skipped 4900 + 50 + 100 = 5050 total
Choose ANY number for your first number. Add 100 to that, to get the other number.
Infinitely many.
41,2
105
25
19,3 17,5 11,11