Page 11 - 新思维数学活动用书6 样章
P. 11
1 The number system
11 Write the decimal number that is represented by – 4 – 20 – 7 – 6 – 9 .
100 1000 10
Challenge
12 Ingrid says, ‘I can multiply by 100 by adding two zeros.’
Explain why Ingrid is wrong.
13 Filipe multiplies a number by 10, then again by 10 and again by 10.
His answer is 7.
What number did he start with?
10
