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MeBest Number Bonds & Doubles These should become automatic. Bonds to 100 + 10 = 10 1 + 9 = 10 2 + 8 = 10 3 + 7 = 10 4 + 6 = 10 5 + 5 = 10 Tip: if you know 3 + 7, you also know 7 + 3. Doubles to 121 + 1 = 22 + 2 = 43 + 3 = 64 + 4 = 85 + 5 = 106 + 6 = 127 + 7 = 148 + 8 = 169 + 9 = 1810 + 10 = 2011 + 11 = 2212 + 12 = 24 Fast doubles help with near doubles like 6 + 7 or 8 + 9. Friends of 10010 + 90 = 100 20 + 80 = 100 30 + 70 = 100 40 + 60 = 100 50 + 50 = 100 25 + 75 = 100 Quick checks1. 6 + 4 = ?2. 8 + 8 = ?3. 70 + ? = 1004. If 2 + 8 = 10, what is 8 + 2?5. If 7 + 7 = 14, what is 7 + 8 close to? MeBest Cheatsheet — Number Bonds & Doubles (SVG)