multiplication
643 x 7
4,501
268 / 3
89
14. A blue ribbon is 242 cm long. A red ribbon is 5 times as long as the blue ribbon. How long is the red ribbon?
242 × 5 = 1210 cm
36 x 9
36 x 10 - 36
324
Susan saved $370 in 5 weeks. If she saved an equal amount each week, how much would she save in 8 weeks?
370 ÷ 5 = 74 per week
74 × 8 = $592
456 x 60
27,360
692 / 4
173
A shopkeeper packed 3284 cakes of soap into 8 equal packages.
a) How many cakes of soap were there in each package?
b) How many cakes of soap were left over?**
3284 ÷ 8 = 410 remainder 4
a) 410 cakes per package
b) 4 leftover
58 x 99
58 x 100 - 58
5,742
Twelve pieces of ribbon, each 5 m long, are cut from a length of ribbon 125 m long. What is the length of the remaining piece of ribbon?
12 × 5 = 60 m used
125 – 60 = 65 m
39 x 19
741
504 / 7
72
The cost of renting a truck is $1450 for a month. 4 men rented it for 4 months. They shared the cost equally. How much did each man pay?
1450 × 4 = 5800
5800 ÷ 4 = $1450 per man
68 x 50
34 x 2 x 50
34 x 100
3,400
Robert bought 1 washing machine and 3 microwave ovens. The washing machine cost 4 times as much as each microwave oven. Each microwave oven cost $365. How much did he spend in all?
Washing machine = 365 × 4 = 1460
Microwaves = 365 × 3 = 1095
Total = 1460 + 1095 = $2555
582 x 66
38,412
8,492/6
1,415
3000 exercise books are arranged in 3 piles. The first pile has ⅕ of the books. The second pile has twice the number of books in the first pile. The third pile has twice the number of books in the second pile. How many books are there in the third pile?
First pile = 3000 × 1/5 = 600
Second pile = 2 × 600 = 1200
Third pile = 2 × 1200 = 2400
32 x 25
8 x 4 x 25
8 x 100
800
Yandao ordered 138 boxes of mangoes. There were 42 mangoes in each box. He kept 2572 mangoes and sold the rest. If he sold them in cartons of 60 mangoes each and sold equal numbers of mangoes, how many mangoes did each carton contain?
Total mangoes = 138 × 42 = 5796
5796 – 2572 = 3224 sold
3224 ÷ 60 = 53 cartons remainder 44
But the question says “equal number of mangoes” — so they want:
3224 ÷ 60 = 53 full cartons, 44 leftover.
295 x 49
14,455
6,284 / 8
785 r 4
45 people took part in a swimming competition. The number of people who took part in the 12-meter swim is 4 times the number of people who took part in the 20-meter swim. How many people took part in the 20-meter swim?
4:1
45/5 = 9
84 x 25
21 x 4 x 25
21 x 100
2,100
Show two ways to find the product of 369 and 14.
Answers (two methods):
Method 1: Standard multiplication
369 × 14 = 5166
Method 2: Break apart
369 × 14 = 369 × (10 + 4)
= 3690 + (369 × 4)
= 3690 + 1476
= 5166