Rounding nearest 10 (Maths)

25 keep the ten or change the ten?

• 20

• 30

12 keep the ten or change the ten?

• 10

• 20

31 keep the ten or change the ten?

• 30

• 40

49 keep the ten or change the ten?

• 40

• 50

23 keep the ten or change the ten?

• 20

• 30

75 keep the ten or change the ten?

• 70

• 80

50 keep the ten or change the ten?

• 50

• 60

42 keep the ten or change the ten?

• 40

• 50

87 keep the ten or change the ten?

• 80

• 90

10 keep the ten or change the ten?

• 10

• 20