Page 9 - 新思维数学活动用书4 样章
P. 9
1 Numbers and the number system
3 The rule for a sequence of numbers is ‘add 3’ each time.
1, 4, 7, 10, 13, . . .
The sequence continues in the same way.
Circle the numbers that are not in the sequence.
22 28 33 40
4 A sequence has the first term 2020 and the term-to-term rule is ‘add 11’.
Write the first five terms of the sequence.
, , , ,
5 Write the next four terms in these linear sequences.
a 10, 7, 4, , , ,
b −9, −7, −5, , , ,
c 1095, 1060, 1025, , , ,
Tip
Remember that −9 is less than −7.
−10 0
−9 −7
Practice
6 Here is part of a number sequence.
The numbers increase by 25 each time.
25, 50, 75, 100, 125, . . .
Circle all the numbers below that will be in the sequence.
355 750 835 900 995
8
