Page 5 - 新思维数学学生用书6 样章

How to use this book

How to use this book

In this book you will find lots of different features to help your learning.

Questions to find out what Getting started

you know already. 1 What is the value of the digit 9 in these numbers? c 123 456.95
a 809.46
b 2021.89
2 Write these numbers in words and digits.
a 200 000 + 5000 + 400 + 8 + 0.9
b 500 000 + 70 000 + 30 + 6 + 0.01
3 a What number is ten times bigger than 0.01?
b What number is one hundred times smaller than 555?
4 What is the missing number?
100 × 10 = 10 000 ÷

What you will learn We are going to …
in the unit. • explain the value of each digit in numbers with up to 3 decimal places
• multiply and divide whole numbers and decimals by 10, 100 and 1000
• compose, decompose and regroup numbers with up to 3 decimal places.

Important words bisect diagonal
justify parallel
that you will use. trapezia

Worked example 1

Step-by-step Write this as a decimal number.
1
3
6
+ 10 +
+
3 +
examples showing 1000 100 10
1
3
6
a way to solve a 10 + 3 + 10 + 100 + 1000 Write the terms in order of size, starting with
the one with the highest place value.
problem. tenths hundredths Put the digits in a place value grid.
thousandths
1
1
1
10 1 10 100 1000
1 3 1 3 6
Answer: 13.136

There are often many different
ways to solve a problem.

4