Singapore Math Level 3A & 3B – Unit 5: Multiplying Numbers by 6, 7, 8 and 9 - 38 Questions
UNIT 5: MULTIPLYING NUMBERS BY 6, 7, 8 AND 9
Q(1-15): Fill in each blank and show your works of multiplying numbers by 6, 7, 8 and 9.
1. 2×6=＿＿
Solution(1):
2 × 6 = 12;
6 + 6 = 12.
2. 5 sixes =＿＿
Solution(2):
5 sixes = 5 × 6 = 30;
6+6+6+6+6+6=30.
3. ＿＿×8=80
Solution(3):
10 × 8 = 80;
8+8+8+8+8+8+8+8+8+8=80.
4. ＿＿×7 = 56
Solution(4):
8 × 7 = 56;
7+7+7+7+7+7+7+7=56.
5. 9×9=＿＿
Solution(5):
9 × 9 = 81;
9+9+9+9+9+9+9+9+9=81.
6. ＿＿×8=40
Solution(6):
5 × 8 = 40;
8+8+8+8+8=40.
7. 4 eights =＿＿
Solution(7):
4 eights = 4 × 8 = 32;
8+8+8+8=32.
8. ＿＿×6=24
Solution(8):
4 × 6 = 24;
6+6+6+6=24.
9. 3 sevens =＿＿
Solution(9):
3 sevens = 3 × 7 = 21;
7+7+7=21.
10. 7×7=＿＿
Solution(10):
7 × 7 = 49;
7+7+7+7+7+7+7=49.
11. 5×9=＿＿
Solution(11):
5 × 9 = 45;
9+9+9+9+9=45.
12. ＿＿×9=72
Solution(12):
8 × 9 = 72;
9+9+9+9+9+9+9+9=72.
13. ＿＿×8=64
Solution(13):
8 × 8 = 64;
8+8+8+8+8+8+8+8=64.
14. ＿＿×8=48
Solution(14):
6 × 8 = 48;
8+8+8+8+8+8=48.
15. 9×0=＿＿
Solution(15):
9 × 0 = 0;
0+0+0+0+0+0+0+0+0=0.
Any number multiplied by 0 equals to 0.
Q(16-20): Match each steering wheel to the correct car.
Solution(16-20):
Matching on the basis of product is shown in the figure below:
Q(21-22): Solve the following multiplication problems using the short-cut method.
21. (a) 7×7 =35+…...+ ……. =35+……. =……...
(b) 8×6 =30+___+____+_____ =30+____ =_______
(c) 8×8 =40+____+_____+____ =40+___ =__
22. (a) 9×8 =___-___ =____
(b) 9×6 =___-__ =______
Solution(21-22):
21.
(a) 7×7
= 35+7+7
= 35+14
= 49
(b) 8×6
= 30+6+6+6
= 30+18
= 48
(c) 8×8
= 40+8+8+8
= 40+24
= 64
22.
(a) 9×8
= 80-8
= 72
(b) 9×6
= 60-6
= 54
Q(23-27): Study the pictures carefully. Fill in each blank by the multiplying numbers rule from given figure.
23.
🪖🪖🪖🪖--🪖🪖🪖🪖--🪖🪖🪖🪖
🪖🪖🪖🪖--🪖🪖🪖🪖--🪖🪖🪖🪖
🪖🪖🪖🪖
There are …… groups of helmets.
There are …… helmets in each group.
There are ……. helmets altogether.
Solution(23):
There are 7 groups of helmets.
There are 4 helmets in each group.
There are 28 helmets altogether. [4×7=28]
24.
👕👕👕👕👕👕👕👕--👕👕👕👕👕👕👕
👕👕👕👕👕👕👕👕--👕👕👕👕👕👕👕
There are ……. groups of T-shirts.
There are …….. T-shirts in each group.
There are …….. T-shirts altogether.
Solution(24):
There are 4 groups of T-shirts.
There are 8 T-shirts in each group.
There are 32 T-shirts altogether. [4×8=32]
25.
🧦🧦🧦--🧦🧦🧦--🧦🧦🧦
There are ___ groups of socks.
There are ____ socks in each group.
There are _____ socks altogether.
Solution(25):
There are 6 groups of socks.
There are 6 socks in each group.
There are 36 socks altogether. [6×6=36]
26.
🥄🥄🥄🥄🥄🥄🥄--🥄🥄🥄🥄🥄🥄🥄
🥄🥄🥄🥄🥄🥄🥄--🥄🥄🥄🥄🥄🥄🥄
🥄🥄🥄🥄🥄🥄🥄-🥄🥄🥄🥄🥄🥄🥄
🥄🥄🥄🥄🥄🥄🥄
There are ___ groups of spoons.
There are ____ spoons in each group.
There are _____ spoons altogether.
Solution(26):
There are 7 groups of spoons.
There are 7 spoons in each group.
There are 49 spoons altogether. [7×7=49]
27.
There are …… groups of staplers.
There are ……. staplers in each group.
There are …….. staplers altogether.
Solution(27):
There are 7 groups of staplers.
There are 8 staplers in each group.
There are 56 staplers altogether. [7×8=56]
Q(28-32): Look at the pictures carefully. Fill in each blanks by writing 2 multiplication and 2 division sentences.
28.
🍬🍬🍬🍬🍬🍬🍬🍬🍬
🍬🍬🍬🍬🍬🍬🍬🍬🍬
🍬🍬🍬🍬🍬🍬🍬🍬🍬
🍬🍬🍬🍬🍬🍬🍬🍬🍬
🍬🍬🍬🍬🍬🍬🍬🍬🍬
🍬🍬🍬🍬🍬🍬🍬🍬🍬
🍬🍬🍬🍬🍬🍬🍬🍬🍬
🍬🍬🍬🍬🍬🍬🍬🍬🍬
…. × ….. = ….. .......÷……=…..
…..×…….=…… …….÷…….=……
Solution(28):
8×9=72 72÷8=9
9×8=72 72÷9=8
29.
🧁🧁🧁🧁🧁🧁--🧁🧁🧁🧁🧁🧁
🧁🧁🧁🧁🧁🧁--🧁🧁🧁🧁🧁🧁
🧁🧁🧁🧁🧁🧁--🧁🧁🧁🧁🧁🧁
🧁🧁🧁🧁🧁🧁
…. × ….. = ….. ......÷……=…..
…..×…….=…… …….÷…….=……
Solution(29):
6×7=42 42÷6=7
7×6=42 42÷7=6
30.
⚘⚘⚘⚘⚘⚘--⚘⚘⚘⚘⚘⚘
⚘⚘⚘⚘⚘⚘--⚘⚘⚘⚘⚘⚘
⚘⚘⚘⚘⚘⚘--⚘⚘⚘⚘⚘⚘
⚘⚘⚘⚘⚘⚘--⚘⚘⚘⚘⚘⚘
⚘⚘⚘⚘⚘⚘
…. × ….. = ….. .......÷……=…..
…..×…….=…… …….÷…….=……
Solution(30):
9×6=54 54÷9=6
6×9=54 54÷6=9
31.
…. × ….. = ….. .........÷……=…..
…..×…….=…… …….÷…….=……
Solution(31):
6×5=30 30÷6=5
5×6=30 30÷5=6
32.
🪑🪑🪑🪑--🪑🪑🪑🪑--🪑🪑🪑🪑
🪑🪑🪑🪑--🪑🪑🪑🪑--🪑🪑🪑🪑
🪑🪑🪑🪑--🪑🪑🪑🪑--🪑🪑🪑🪑
…. × ….. = ….. ......÷……=…..
…..×…….=…… …….÷…….=……
Solution(32):
9×4=36 36÷9=4
4×9=36 36÷4=9
Solve the following word problems. Show your work in the space below.
33. Andy bought 6 bags of apples. There were 8 apples in each bag. How many apples did he buy altogether?
Solution(33):
6×8=48
He bought 48 apples altogether.
34. Samantha buys 5 novels at a bookshop. If each novel costs $6, how much does Samantha pay for all the novels?
Solution(34):
5×$6=$30
Samantha pays $30 for all the novels.
35. A group of students are going to the zoo by car. They need 7 cars altogether. If 5 students sit in each car, how many students are there in the group?
Solution(35):
7×5=35
There are 35 people in the group.
36. Enzo bakes 9 trays of chocolate chip muffins. There are 8 chocolate chip muffins on each tray. How many chocolate chip muffins does Enzo bake altogether?
Solution(36):
9×8=72
Enzo bakes 72 chocolate chip muffins altogether.
37. Elizabeth has 42 stamps. She shares these stamps with 6 friends. How many stamps does each friend have?
Solution(37):
42÷7=6
Each of them has 6 stamps.
38. Mrs. Arnold bought 64 oranges. He put them equally into 8 bags. How many oranges were there in each bag?
Solution(38):
64÷8=8
There were 8 oranges in each bag.
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