Page 23 - 新思维数学学生用书4 样章

1 Numbers and the number system

Check your progress

1 The term-to-term rule for this sequence of numbers is add three

each time.

401, 404, 407, 410, 413, 416, 419, ...
The sequence continues in the same way.

Which of these numbers do not belong to the sequence?

422 428 430 434

2 The numbers in this sequence increase by 50 each time.

70 +50 120 +50 170 +50 ...

What is the first number in the sequence that is greater than 500?

3 Here are three different sequences.

6, 8, 10, 12, . . . 8, 11, 14, 17, . . . 1, 3, 5, 7, . . .

Choose two of the sequences.

In what ways are the two sequences the same?

In what ways are the two sequences different from the third sequence?

4 The temperature in Iceland is −1 °C.

The temperature in Mongolia is 31 °C colder.
What is the temperature in Mongolia?

5 Use digits to write these numbers.

a Three hundred and thirty-five thousand, two hundred and

seventy-one.

b One hundred and five thousand and fifty.
c One hundred and twenty thousand, two hundred and two.

6 Write these numbers in words.

a 307 201 b 577 006 c 790 320

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