Přičítej a odčítej desítky.

99 – 70 =	88 – 40 =	33 + 30 =	80 + 10 =
57 + 30 =	42 – 30 =	75 – 50 =	36 + 50 =
81 – 60 =	67 – 40 =	59 + 30 =	19 + 80 =
83 – 30 =	42 + 20 =	28 + 60 =	38 + 20 =
61 – 40 =	49 + 50 =	73 – 60 =	51 + 40 =