This book is very good.
There are plenty of Kumon books for numbers ( 1-30, 1-70,1-120, 1-150 etc). While it is a legitimate wishful thinking of every parent that their kids be good at numbers of over 100, my suggestion is that the kids have to first get past this book on numbers before stepping into others.
My kid is in prek at a Montessory school, So my purpose of buying the book was to reinforce what is taught at school.
The book is very good in a way it takes the kid through the complexity of numbers in a clean fashion.First a generic drawing connecting the numbers etc.. However the biggest drawback I found in the book is the number of pages.There is virtually no repetition possible if the kid is not getting past a set of numbers.
I will use number 2 as an example from a kid's perspective
Exercise goes like this :
Chapter 11 :
1,2,3 (the kid writes 4 times)
2,3,4 (the kid writes 4 times)
3,4,5 (the kid writes 4 times and so on )
Problem is the kid gets to write, for example a difficult number like 2 total of 8 times. Again the kid gets a glimpse of number 2 in chapter 15 ( assume this happens after few days where kid has forgotten how to write it)
1-4 ( write 3 times)
And then the chapters pretty much assumes that the kid knows the numbers and gets into exercises like matching the numbers with number of fruits etc.
Similar to most kids, my kid had problems writing 7,9 and 10 ( In spite of my kid writing at school) .I had to make between 3-5 copies of every exercise and asked her to write it out,so she became familiar and ready for the subsequent exercises.
If the kids dont grasp 1-10 effectively, the whole subsequent exercises till 30 goes in vain.
And if you need a photocopier , then the purpose of buying a book is defeated, afterall there are so many websites from where you can download similar lessons!
Kumon Publishers,you are doing an awesome job ,but please do not do penny pinching...Charge few dollars more and make the book over 200 pages with several optional exercises.!