Page 21 - 新思维数学学生用书6 样章

2 Numbers and sequences

2.1 Counting and sequences

We are going to …

• count on and back using fractions and decimals

• find and use the position-to-term rule of a sequence.

In Stage 5, you learned how to use a term-to-term rule to position-to-term rule
find the next term in a sequence. In this unit, you will learn term

how to use the position-to-term rule to find any term in
a sequence. term-to-term rule

Position Term

1 4
+4
2 8 The 25th term is 25 × 4 = 100.
+4
3 12
+4
4 16

Multiply by 4

Worked example 1

a Follow the instructions in the flow diagram to generate a sequence.

Is the YES
Start Write down 2 Add 2 answer Stop
more
than 20?

NO
Write down
the answer

20