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EZYgardener,
That's a healthy cactus you have there.
But it's actually Opuntia humifusa instead of O. monacantha. O. monacantha pads are larger and more elongated than yours.
Your's is prostrate and O. monacantha grows more upright.
The spines are also different, compare with these spines of O. humifusa: http://davesgarden.com/guides/pf/showimage/174090/