Question
Complete the number pattern.

90, 100, 200, 210, 310, 320, 420, (a)        , (b)        , 540
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.

90, 100, 200, 210, 310, 320, 420, (a)        , (b)        , 540