# Use concrete materials or fingers to model and solve simple addition and subtraction problems

1. | Red Blocks 4 - 1 | |

2. | Red Blocks 1 - 1 | |

3. | Red Blocks 2 - 1 | |

4. | Red Blocks 3 - 1 | |

5. | Red Blocks 5 - 1 | |

6. | Red Blocks 6 - 1 | |

7. | Red Blocks 7 - 1 | |

8. | Red Blocks 8 - 1 | |

9. | Red Blocks 9 - 1 |