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Year3 Math
任务 21-1：The strategy of thinking from the conditions(2)
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任务 List
任务 1：Mental calculation and estimation of whole tens and hundreds multiplied by a one-digit number
任务 2-1：Problems of Multiples
任务 2-2：Exercise1
任务 3-1：Vertical multiplication of two or three-digit numbers and one-digit number
任务 3-2：Exercise
任务 4-1：Multiplication with zeros in the middle or at the end of the multiplier
任务 4-2：Exercise4
任务 5：Understanding kilograms and grams
任务 6-1：Unit conversion and comparison
任务 6-2：Exercise
任务 7：Exercise
任务 8：Understanding Rectangles and Squares
任务 9：Understanding the Perimeter
任务 10：Calculation of the perimeter of rectangles and squares
任务 11：Exercise1
任务 12：Exercise2
任务 13：Exercise3
任务 14：Mental division
任务 15-1：Check the Division
任务 15-2：Exercise
任务 16：Short division
任务 17：Exercise3
任务 18：Exercise4
任务 19-1：Short division （2）
任务 19-2：Exercise5
任务 20：The strategy of thinking from the conditions(1)
任务 21-1：The strategy of thinking from the conditions(2)
任务 21-2：Exercise
任务 22：Translation and Rotation
任务 23-1：Axially Symmetrical Figures
任务 23-2：Exercise1
任务 24：Understanding Fractions
任务 25：Simple addition and subtraction of fractions （same denominator）
任务 26：Exercise1
任务 27：Exercise2
任务 28：Mental calculation and estimation of two-digit numbers multiplied by two-digit numbers
任务 29-1：Vertical multiplication of two-digit numbers with and without carrying
任务 29-2：Exercise1
任务 30：problem solving by using two-step multiplication
任务 31：Exercise2
任务 32：Exercise3
任务 33：Understanding kilometers
任务 34：Understanding the tons
任务 35：Exercise1
任务 36：Exercise2
任务 37：Analyze and solve problems starting from the question(1)
任务 38：Analyze and solve problems starting from the question(2)
任务 39：Exercise1
任务 40：Exercise2
任务 41：Mixed operations of multiplication with addition or subtraction
任务 42：Mixed operations of division with addition or subtraction
任务 43：Mixed operations of division with addition or subtraction
任务 44：Exercise1
任务 45：Exercise2
任务 46：Understanding years, months, and days
任务 47-1：Understanding common years, leap years, and the 24-hour
任务 47-2：Exercise1
任务 48-1：Time interval
任务 48-2：Exercise2
任务 49-1：Area and size comparison
任务 49-2：Exercise1
任务 50：Area Units and Conversions
任务 51：calculation of rectangles and squares' Area
任务 52：Exercise2
任务 53：Exercise3
任务 54：Exercise4
任务 55：Fractions （1）
任务 56：Fractions （2）
任务 57：Exercise1
任务 58：Understanding decimals and comparing decimals
任务 59：Simple decimal addition and subtraction
任务 60：Exercise1
任务 61：Simple data summary
任务 62：Simple data sorting and grouping
任务 63：Exercise1
