5.9 – 5.3 = 50×4= 300 – 168 = 48+29 =
100 – 36 = 102×3= 408÷4 = 360÷3 =
42×16 = 515÷5 = 405×6 = *504÷8 =
576÷3÷4 17×34 – 278 (601 – 246)÷5 400 - 320÷2