+x=36 6.5:x=3.25:4
56×10%= 3.2+1.78= ﹣= 0.72÷0.6=
1.25×8= 4÷= ×= ×6÷×6=
1.2×2= 20×33%= 31×299≈
0.4÷8= + = 631÷9≈