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學生說明
1. Use the 120's chart to help you fill out the more and less square
2. Find 1 more, 1 less, 10 more and 10 less than than the number in the middle of the square.
3. Finish all pages and press 
教師備註 (學生不可見)
120's chart from: http://www.thehappyteacher.co/2018/06/race-to-100-hundreds-chart-game.html?m=1
