109
Making a number several times bigger
Textbook: Part 3, lesson 103, pp. 66–67
GoalMake a number several times bigger: tell “times more” from “more by”.
New words
times · martamaking bigger · orttirishincreasing by an amount · ta ga orttirishmore · ko‘p
Explanation
To make a number n times bigger we multiply it by n. 4 made 3 times bigger is 4 × 3 = 12. Be careful: “3 times more” means multiply, “3 more” means add. 4 made 3 more is 4 + 3 = 7.
Worked examples
8 guests came to Salim’s birthday and 3 times as many to his grandfather’s: 8 × 3 = 24 guests.
7 made 2 times bigger is 14, and 7 made 2 more is 9.
Class activity
“Times or more?”: the teacher reads phrases (“5 more”, “5 times as many”). Children hold up a “+” or “×” card, then calculate.
Practice
1
Salim’s birthday had 8 guests and his grandfather’s anniversary had 3 times as many. How many guests were at the anniversary?
24
2
6 cups and 2 times as many saucers were cleared from the table. How many dishes in total?
18
3
Make 9 five times bigger.
45
4
Make 7 bigger by 2.
9
5
A 3 cm segment was made 4 times longer. How many cm is the new segment?
12