Question
Complete the number pattern.

80, 90, 190, 200, 300, 310, 410, (a)       , 520, (b)       
2 m
(a)

Click button first when a symbol is required. X

(b)

Click button first when a symbol is required. X

Complete the number pattern.

80, 90, 190, 200, 300, 310, 410, (a)       , 520, (b)