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0-20 Addition & Subtraction Workbook Kids Learning Math Number Axis Calculation Exercise Operation Worksheets Children Preschool Numbers and Line Tracing Activity Book Size: 28cm/11.02in * 20.7cm/8.15in Page : 28 pages Improve your child's success in class with lots of addition and subtraction practice - Solutions Included. This book contains lots of math worksheets - Comfortable spacing in numbers for calculating where needed. This Workbook can be used for school or home worksheets.