|--------Unit 1: More and less Free

  |--------Unit 2: Shapes Free

  |--------Unit 3: Numbers 1, 2, 3 Free

  |--------Unit 4: Numbers 1, 2, 3, 4, 5 Free

  |--------Unit 5: Less than, sign < Free

  |--------Unit 6: Greater than, sign > Free

  |--------Unit 7: Equal to, sign = Free

  |--------Unit 8: Number 6 Free

  |--------Unit 9: Number 7 Free

  |--------Unit 10: Number 8 Free

  |--------Unit 11: Number 9 Free

  |--------Unit 12: Number 0 Free

  |--------Unit 13: Number 10 Free

  |--------Unit 14: Addition within 3 Free

  |--------Unit 15: Addition within 4 Free

  |--------Unit 16: Addition within 5 Free

  |--------Unit 17: Number 0 in addition Free

  |--------Unit 18: Subtraction within 3 Free

  |--------Unit 19: Subtraction within 4 Free

  |--------Unit 20: Subtraction within 5 Free

  |--------Unit 21: Number 0 in subtraction Free

  |--------Unit 22: Addition within 6 Free

  |--------Unit 23: Subtraction within 6 Free

  |--------Unit 24: Addition within 7 Free

  |--------Unit 25: Subtraction within 7 Free

  |--------Unit 26: Addition within 8 Free

  |--------Unit 27: Subtraction within 8 Free

  |--------Unit 28: Addition within 9 Free

  |--------Unit 29: Subtraction within 9 Free

  |--------Unit 30: Addition within 10 Free

  |--------Unit 31: Subtraction within 10 Free

  |--------Unit 32: Addition and subtraction table within 10 Free

  |--------Unit 33: Point and line segment Free

  |--------Unit 34: Length of the line segment Free

  |--------Unit 35: Practicing measuring length Free

  |--------Unit 36: A ten, the number line Free

  |--------Unit 37: Eleven. Twelve Free

  |--------Unit 38: Thirteen. Fourteen. Fifteen Free

  |--------Unit 39: Sixteen. Seventeen. Eighteen. Nineteen. Free

  |--------Unit 40: Twenty, 2 tens Free

  |--------Unit 41: Addition in the format 14 + 3 Free

  |--------Unit 42: Subtraction in the format 17 - 3 Free

  |--------Unit 43: Subtraction in the format 17 - 7 Free

  |--------Unit 44: Word problems Free

  |--------Unit 45: Solving a word problem 1 Free

  |--------Unit 46: Solving a word problem 2 Free

  |--------Unit 47: Centimeter. Measuring length. Free

  |--------Unit 48: Draw a line segment given its length Free

  |--------Unit 49: Whole tens Free

  |--------Unit 50: Adding whole tens Free

  |--------Unit 51: Subtracting whole tens Free

  |--------Unit 52: A point inside and outside a shape Free

  |--------Unit 53: Numbers 20 - 50 Free

  |--------Unit 54: Numbers 50 - 70 Free

  |--------Unit 55: Numbers 70 - 99 Free

  |--------Unit 56: Comparing two numbers Free

  |--------Unit 57: 100 number chart Free

  |--------Unit 58: Addition within 100 (without regrouping) Free

  |--------Unit 59: Subtraction within 100 (without regrouping) Free

  |--------Unit 60: Subtraction within 100 (without regrouping) Free

  |--------Unit 61: Days of the week Free

  |--------Unit 62: Addition and Subtraction within 100 (without regrouping) Free

  |--------Unit 63: Clock. Time. Free