Review multiplication and division tables

### 1.1. Knowledge to remember

- Need to know the multiplication table carefully.
- Sample calculation exercises need to be based on that pattern to perform the next sentences.

### 1.2. Solving textbook exercises on Reviewing multiplication tables

**Lesson 1: **a) Mental calculation:

3 x 4 = | 2 x 6 = | 4 x 3 = | 5 x 6 = |

3 x 7 = | 2 x 8 = | 4 x 7 = | 5 x 4 = |

3 x 5 = | 2 x 4 = | 4 x 9 = | 5 x 7 = |

3 x 8 = | 2 x 9 = | 4 x 4 = | 5 x 9 = |

b) Mental calculation:

Mental:

hundred hundredSo:

200 x 2 = 300 x 2 =

200 x 4 = 400 x 2 =

100 x 5 = 500 x 1 =

**Solution guide: **

a)

3 x 4 = 12 | 2 x 6 = 12 | 4 x 3 = 12 | 5 x 6 = 30 |

3 x 7 = 21 | 2 x 8 = 16 | 4 x 7 = 28 | 5 x 4 = 20 |

3 x 5 = 15 | 2 x 4 = 8 | 4 x 9 = 36 | 5 x 7 = 35 |

3 x 8 = 24 | 2 x 9 = 18 | 4 x 4 = 16 | 5 x 9 = 45 |

b)

200 x 2 = 400 300 x 2 = 600

200 x 4 = 800 400 x 2 = 800

100 x 5 = 500 500 x 1 = 500

**Lesson 2:** Calculate (according to form)

Sample: 4 x 3 + 10 = 12 + 10 = 22

a) 5 x 5 +18; b) 5 x 7 – 26; c) 2 x 2 x 9.

**Solution guide:**

a) 5 x 5 +18 = 25 + 18 = 43

b) 5 x 7 – 26 = 35 – 26 = 9

c) 2 x 2 x 9 = 4 x 9 = 36

**Lesson 3:** In a dining room there are

table, each folding table bàn

$4$chair. How many chairs are there in that dining room?

**Solution guide:**

- Number of chairs in the dining room = Number of chairs per table multiplied by number of tables
- Summary:

The dining room has:

$8$table

A table has:

$4$chair

The dining room has: … a chair?

**Solution**

The number of chairs in the dining room is:

(chair)

Answer:

chair**Lesson 4: **Calculate the perimeter of the triangle

Dimensions shown on the figure:

**Solution**

The perimeter of triangle ABC is:

AB + BC + AC = 100 + 100 + 100 = 300 (cm)

Answer: 300 cm

### 1.3. Solving textbook exercises on Reviewing division tables

**Lesson 1: **Mental arithmetic

3 x 4 = | 2 x 5 = | 5 x 3 = | 4 x 2 = |

12 : 3 = | 10 : 2 = | 15 : 3 = | 8: 2 = |

12 : 4 = | 10 : 5 | 15 : 5 = | 8: 4 = |

**Solution guide:**

3 x 4 = 12 | 2 x 5 = 10 | 5 x 3 = 15 | 4 x 2 = 8 |

12 : 3 = 4 | 10 : 2 = 5 | 15 : 3 = 5 | 8: 2 = 4 |

12 : 4 = 3 | 10 : 5 = 2 | 15 : 5 = 3 | 8: 4 = 2 |

**Lesson 2: **Mental arithmetic

200 : 2 = ?

Mental: 2 hundred : 2 = 1 hundred

So: 200 : 2 = 100

400 : 2 = 800 : 2 =

600 : 3 = 300 : 3 =

400 : 4 = 800 : 4 =

**Solution guide:**

400 : 2 = 200 800 : 2 = 400

600 : 3 = 200 300 : 3 = 100

400 : 4 = 100 800 : 4 = 200

**Lesson 3: **There are 24 toads arranged evenly in 4 boxes. How many toads are in each box?

**Solution guide:**

- Number of cups in the box = Number of cups : Number of boxes
- Summary:

Yes :

$24$Cup

Sort into:

$4$box

Ask each box: … the ?

**Solution:**

The number of cups in each box is:

$6$

(piece)

Answer:

the**Lesson 4:** Each number in the circle is the result of which calculation?

**Solution guide:**

.

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### Related posts:

- Watch the clock
- Practice solving math problems
- Geometry review
- Subtract three-digit numbers (remember once)
- Add three-digit numbers (remember once)
- Add and subtract three-digit numbers (don’t remember)
- Read, write, compare three-digit numbers
- Math 2 Lesson: Subtracted Numbers – Subtracted Numbers
- Math 2 Lesson: Decimeter

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