Rounding Quiz (Combined) 小數位及有效數字：同步測驗
輸入正確答案後（不可包含空格）按「核對」。答對得1分，答錯不扣分。
Press “Check” after entering answers (spaces are not allowed). One mark is scored for each correct answer. No marks are deducted for wrong answers.
gMath 互動數學教室
http://www.gmath.hk