月 日
一、20道口算
900× 5 = 360－240= 270＋450= 365＋235 = 3400－400 =
17 × 20 = 800 × 6= 80 ÷ 4 = 240 ÷ 6 = 360 ÷ 9 =
600 ÷ 3 = 400÷ 4 = 45 ÷ 9 = 2100 ÷ 7 = 810 ÷ 6 =
18 × 7 = 810 ÷ 9 = 67 + 8 = 82 + 7 = 104 × 3 =