42×2 = 47＋ 32= 1000克× 3 = 68＋ 17=
    80÷ 4= 42÷ 2 = 20分＋ 30分= 500× 6=
    60× 3= 72 －28= 4 ×22 = 84 －34=
    66÷ 6= 55 ＋37= 43 ×2 = 44＋ 46=
    60÷ 2 = 52－ 45 = 300 ×7 = 300＋ 7=
    65－ 59= 66 ＋24 = 5× 800 = 44 ÷4 =
    72 －8 = 3× 21 = 65－ 35 = 1100－500=
    4× 21 = 38 ＋19 = 4× 600 = 71－ 24 =
    80－ 26= 82÷ 2 = 50－ 26= 110× 8=
    15＋ 60= 75 －68= 66 ÷3 = 25＋ 57=