`1 1/3 + 2 1/5 = `
`1 + 3 + 1/3 + 1/5 = ` `4 + 8/15 = ` `4 8/15`
`3 2/7 + 4 3/8 =`
`3 + 4 + 2/7 + 3/8 =` `7 + 37/56 =` `7 37/56`
`5 3/8 + 2 7/9 =`
`5 + 2 + 3/8 + 7/9 =` `7 + 83/72 = 7 + 1 11/72` `= 8 11/72`
`7 1/5 + 4 2/3 =`
`7 + 4 + 1/5 + 2/3 =` `11 + 13/15 =` `11 13/15`
`2 1/5 - 1 1/3 =`
`2 - 1 + 1/5 - 1/3 =` `1 - 2/15 =` `13/15`
`4 3/8 - 3 2/7 =`
`4 - 3 + 3/8 - 2/7 =` `1 + 5/56 =` `1 5/56`
`5 3/8 - 2 7/9 =`
`5 - 2 + 3/8 - 7/9 = ` `3 - 29/72 =` `2 + 43/72 = 2 43/72`
`7 1/5 - 4 2/3 = `
`7 - 4 + 1/5 - 2/3 =` `3 - 7/15 =` `2 + 8/15 = 2 8/15`