Page 17 - 新思维数学活动用书4 样章
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1 Numbers and the number system
1.3 Understanding place value
Worked example 3
Which number is 10 times smaller than seven thousand and seventy?
7700 707 7007 770 7070
When you divide by 10,
1000s 100s 10s 1s
all the digits move one
7 0 7 0
place to the right.
7 0 7
Answer: 7070 ÷ 10 = 707
compose decompose equivalent hundred thousand million
place holder regroup ten thousand thousand
Exercise 1.3
Focus
1 The distance from London in England to Budapest in Hungary is
1450 km.
Write the number 1450 in words.
2 Circle the number that is five thousand and five.
50 005 5050 5005 50 050 5550
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