Page 10 - 新思维数学活动用书4 样章
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1.1 Counting and sequences
7 Amy makes a number sequence.
The first term of her sequence is 1.
Her term-to-term rule is ‘add 7’.
Amy says, ‘If I keep adding 7, I will reach 77.’
Is Amy correct? Explain your answer.
8 Here is part of a number sequence. Tip
The first number is missing.
Remember
−5 −5 −5
297 292 287 to work
backwards.
Write the missing number.
9 A sequence has first term 1001 and last term 1041.
The term-to-term rule is ‘add 5’.
Write down all the terms in the sequence.
10 Each number in this sequence is double the previous number.
Write the missing numbers.
, 3, 6, 12, 24, 48,
Challenge
11 Write the missing number in this sequence.
1, 3, 6, 10,
Explain how you worked it out.
9
