The document contains examples of multiplication exercises for students to practice. It includes exercises asking students to write out multiplication as repeated addition, fill in multiplication problems, calculate various multiplication problems involving positives and negatives, and substitute values into expressions involving variables. The exercises increase in complexity, starting with basic multiplication and moving towards more advanced problems combining multiplication, subtraction and variables.

1. แบบฝึกหัดที่ 1
คาชี้แจง ให้นักเรียนเติมคาตอบลงในตารางให้ถูกต้อง
โจทย์ เขียนการคูณในรูปการบวก ผลคูณ สรุป
 5×2 2+2+2+2+2 10 5 × 2 = 10
 3 × (-4) (-4) + (-4) + (-4) -12 3 × (-4) = -12
1. 4 ×6
2. 2 × 30
3. 3 ×3
4. 5 × 8
5. 3 × 50
6. 2 ×(-7)
7. 4 × (-4)
8. 3 ×(-15)
9. 2 ×(-25)
10. 2 × (-50)
11. 3 × (-13)
12. 3 × 13
13. 2 × 55
14. 2 × (-55)
15. 5 × 12

2. แบบฝึกที่ 2
คาชีแจง จงเติมคาตอบลงในช่องว่างให้ถูกต้อง
้
1. × 4 = 24
2. × (-3) = -18
3. × (-12) = -60
4. × 5 = 45
5. × (-7) = -35
ง่ายนิดเดียวเอง
6. 8 × = 40
น้องๆ ต้องทาได้
ใช่ไหมครับ
7. 10 × = -100
8. 3 × = -21
9. 6 × = -24
10. 5 × = 500

3. แบบฝึกที่ 3
คาชี้แจง ให้นักเรียนหาผลคูณของจานวนต่อไปนี้
จงหาผลลัพธ์
1. 4 × (-25) =...........................................
2. 40 × 40 = ...........................................
3. 12 ×(-30) =............................................
4. 8 × (-8) =.............................................
5. 13 × 5 =……………………………
6. 11 × (-9) = ……………………………
7. 80 × (-8) =.............................................
8. 15 × 7 =.............................................
9. 18 × (-5) =.............................................
10. 30 ×(-10) =.............................................
11. 3 ×[2 ×(-5)] =………………….........
12. 30 ×1 × (-8) =………………….........
13. (11 ×2) ×(-10) =………………….........
14. 5 ×(-12) ×(-2) =………………….........
15. (2 ×2) ×[2 ×(-1)] =………………............
16. (-1) ×(-2) ×(-3) ×(-4) =………………............
17. 10 ×15 × (-1) =………………….........
18. (-5) ×(-5) ×2 = ………………………
19. (-1) ×1 ×(-2) ×(-2) =………………............
20. (-4) ×(-5) ×(-2) ×(-10) =………………............

4. แบบฝึกที่ 4
คาชี้แจง จงแทนค่าตัวแปรที่กาหนดให้ และแสดง วิธีทา
กาหนดให้ a = -3 , b = -2 และ c = 4
ตัวอย่าง (a - b) × (a + c) = ((-3)-(-2)X × ((-3)+4)
= ((-3)+2) × 1
= (-1) × 1
= -1
ตอบ -1
1. a × b × c
=.....................................................................................................................
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2. (a + c) × b
=.....................................................................................................................
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5. 3. (a - b) × (a + b)
=.......................................................................................................................
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4. (a – b) × (a + b + c)
=......................................................................................................................
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5. (a + b) × (a – b - c)
=.......................................................................................................................
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แบบฝึกที่ 7
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