Question
100Â Â Â 180Â Â Â 294Â Â Â 448Â Â Â 648Â Â
 ?Solution
53 – 52 = 100 63 – 62 = 180 73 – 72 = 294 83 – 82 = 448 93 – 92 = 648 103 – 102 = 900 Alternate method: 52 × 4 = 100 62 × 5 = 180 72 × 6 = 294 82 × 7 = 448 92 × 8 = 648 102 × 9 = 900
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