Fourth Grade Challenging Math

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4-14)    Answer

a)  3, 4, 6, 9, 13, 18, 24
       \ / \ / \ / \ /  \ /   \ /
        1  2  3  4   5    6    <-- The difference between 2 numbers has a pattern

b)   1, 2, 5, 10, 17, 26, 37
        \ / \ / \  / \  / \  /  \  /
         1  3   5   7   9   11   <-- The difference between 2 numbers has a pattern

c)   6, 8, 12, 18, 26, 36
       \ /  \ /  \   /  \  /  \  /
        2   4    6   8  10       <-- The difference between 2 numbers has a pattern

d)   45, 30, 18, 9, 3, 0
         \  /  \  / \ / \ /  \ /
         15  12   9  6   3      <-- The difference between 2 numbers has a pattern