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1) 1 × 53 = 1 × (50 + 3) = 50 + 3 = 53
2) 2 × 22 = 2 × (20 + 2) = 40 + 4 = 44
3) 2 × 33 = 2 × (30 + 3) = 60 + 6 = 66
4) 3 × 19 = 3 × (10 + 9) = 30 + 27 = 57
5) 2 × 23 = 2 × (20 + 3) = 40 + 6 = 46
6) 2 × 32 = 2 × (30 +2) = 60 + 4 = 64
7) 1 × 53 = 1 × (50 + 3) = 50 + 3 = 53
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2)2×22=2×(20×2)=40+4=44
3)2×33=2×(31+2)=62+4=66
4)3×19=3×(16+3)=48+9=57
5)2×23=2×(21+2)=42+4=46
6)2×32=2×(30+2)=60+4=64
7)1×53=1×(52+1)=52+1=53