Question

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Answer 1

2. 
a x 9 :

9 x 9 = 81

18 x 9 = 162

99 x 9 = 891

374 x 9 = 3366

906 x 9 = 8154


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a + 15 :

9 + 15 = 24

18 + 15 = 33

99 + 15 = 114

374 + 15 = 389

906 + 15 = 921
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b x 15 :

15 x 15 = 225

26 x 15 = 390

77 x 15  = 1155

208 x 15 = 3120

319 x 15 = 4785

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b + 15 :

15 + 15 = 30

26 + 15 = 41

77 + 15 = 92

208 + 15 = 223

319 + 15 = 334