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Free
Unit 1: Addend - Sum
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Free
Unit 2: Decimeters
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Free
Unit 3: Minuend - Subtrahend - Difference
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Free
Unit 4: Addition with sums equal to 10
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Free
Unit 5: Addition with sums equal to whole tens
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Free
Unit 6: Adding 9 to a 1-digit number
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Free
Unit 7: Addition 29 + 5, 39 + 15
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Free
Unit 8: Adding 8 to a 1-digit number
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Free
Unit 9: Addition 38 + 5, 48 + 25
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Free
Unit 10: Rectangles and quadrilaterals
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Free
Unit 11: More than problems
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Free
Unit 12: Adding 7 to a 1-digit number
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Free
Unit 13: Addition 17 + 5, 57 + 25
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Free
Unit 14: Less than problems
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Free
Unit 15: Kilograms
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Free
Unit 16: Adding 6 to a 1-digit number
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Free
Unit 17: Addition 26 + 5, 46 + 25
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Free
Unit 18: Addition table
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Free
Unit 19: Addition with sums equal to 100
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Free
Unit 20: Liters
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Free
Unit 21: Solving for a missing addend in a sum
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Free
Unit 22: Subtracting a number from whole tens
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Free
Unit 23: Subtracting a 1-digit number from 11
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Free
Unit 24: Subtraction 31 - 5, 51 - 15
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Free
Unit 25: Subtracting a 1-digit number from 12
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Free
Unit 26: Subtraction 32 - 8, 52 - 28
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Free
Unit 27: Solving for a minuend
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Free
Unit 28: Subtracting a number from 13
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Free
Unit 29: Subtraction 33 - 5; 53 - 15
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Free
Unit 30: Subtracting a number from 14
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Free
Unit 31: Subtraction 34 - 8, 54 - 18
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Free
Unit 32: Subtracting a number from 15, 16, 17 or 18
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Free
Unit 33: 35 -8, 56- 7, 37- 8 and 68 - 9
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Free
Unit 34: 55 - 18, 66 - 37, 67 - 38 and 58 - 19
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Free
Unit 35: Subtraction table
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Free
Unit 36: Subtracting a number from 100
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Free
Unit 37: Solving for a subtrahend
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Free
Unit 38: Lines
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Free
Unit 39: Days and time. Practice in reading time
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Free
Unit 40: Days and months. Practice in reading calendar
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Free
Unit 41: Sum of addends
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Free
Unit 42: Multiplication
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Free
Unit 43: Factors - Products
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Free
Unit 44: Multiplication table of 2
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Free
Unit 45: Multiplication table of 3
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Free
Unit 46: Multiplication table of 4
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Free
Unit 47: Multiplication table of 5
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Free
Unit 48: Broken lines and length of broken lines
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Free
Unit 49: Division
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Free
Unit 50: Division table of 2
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Free
Unit 51: One half
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Free
Unit 52: Dividends-Divisors-Quotients
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Free
Unit 53: Division table of 3
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Free
Unit 54: One third
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Free
Unit 55: Solving for a factor in a multiplication
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Free
Unit 56: Division table of 4
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Free
Unit 57: One fourth
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Free
Unit 58: Division table of 5
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Free
Unit 59: One fifth
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Free
Unit 60: Hours, minutes. Practice in reading time
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Free
Unit 62: Perimeter of a triangle or a quadrilateral
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Free
Unit 63: Number 1 in multiplication and division
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Free
Unit 64: Number 0 in multiplication and division
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Free
Unit 65: Ones, tens, hundreds and thousands. Comparing whole hundreds
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Free
Unit 66: Numbers from 110 to 200
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Free
Unit 67: 3-digit numbers. Comparing 3-digit numbers
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Free
Unit 68: Meters
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Free
Unit 69: Kilometers
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Free
Unit 70: Millieters
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Free
Unit 71: Write 3-digit numbers in extended form
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Free
Unit 72: Addition(without regrouping) within 1000
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Free
Unit 73: Subtraction(without regrouping) within 1000
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Free
Unit 74: Vietnamese currency