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Verified Answer :

You could count by 2 or by adding 5+5 or 5x2 but I think there is more than what I added

  1. 5 + 5 = 10

    2. 2 · 5 = 10

    3. 10 · 1 = 10

    4. 100 ÷ 10 = 10

    5. 7 + 3 = 10

    6. 6 + 4 = 10 

    7. 8 + 2 = 10

    8. 12 - 2 = 10

    9. 177,329,132 - 177,329,122 = 10

    10 999,999,999,999,999 - 999,999,999,999,989 = 10