Question
Complete the number pattern.

70, 80, 180, 190, 290, 300, 400, (a)        , (b)        , 520
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.

70, 80, 180, 190, 290, 300, 400, (a)        , (b)        , 520