Estimating Percentages

Estimating Percentages - Transcript

Estimating Percntages
Do these in you head

50 of
What is 50 of 34 What is 50 of 129

Take half of the number or divide by 2

25
25 is half of 50 25 is of the number Divide by 4 What is 25 of 12 What is 25 of 870

75
75 is times as much as 25 25 is of the number Divide by 4 then multiply by 3 What is 75 of 12 What is 75 of 870

Thirds

33 3
1
33 1 3 is 1 3 of the number Divide by 3

What is 33 1 3 of 69 What is 33 1 3 of 74

66 3
2
66 2 3 is twice 33 1 3 Divide by 3 then times by 2

What is 66 2 3 of 69 What is 66 2 3 of 74

tenths

10
10 of 34 is 3 4 10 of 157 is 15 7 10 of 2 9 is 0 29 What happens with the decimal when you find 10 The decimal moves one space left to find 10

10
What is 10 of 52 What is 10 of 158 What is 10 of 2 3

20
20 is twice as much as 10 Find 10 and times by 2 What is 20 of 52 What is 20 of 158 What is 20 of 2 3

30
30 is times as much as 10 Find 10 and times by 3 What is 30 of 52 What is 40 of 158 What is 60 of 2 3

5
5 is half as much as 10 Find 10 and divide by 2 What is 5 of 52 What is 5 of 158 What is 15 of 2 3