1 | Divide the number in half - up to 20 [1] | | | |

2 | Divide the number in half - up to 20 [2] | | | |

3 | Divide the number in half - up to 30 | | | |

3 | Divide the number in half - up to 50 [1] | | | |

3 | Divide the number in half - up to 50 [2] | | | |

4 | Divide the number in half - up to 100 [1] | | | |

5 | Divide the number in half - up to 100 [2] | | | |