Show:
A:Fix My Mistake
B
C : Solve 1
D : Solve 2
E : Solve 3
100

9 - 3 x 2 = 12

9 - 3 x 2 = 3 or

(9 - 3) x 2 = 12

100

3 + 6 x 4

27

100

(14 + 6) x (12 -4) -9

151

100

( 9  + 3 x 5 ) ÷ 3

8

200

10÷5 x 2 = 1

10÷5 x 2 = 4 or

10 ÷ (5 x 2) = 1 or

10 ÷ 5 ÷ 2 = 1

200

What should I do first?

4 x (3 + 5)

先做那一部份 ?

4 x (3 + 5)


(   )


200

25 ÷ 5 -2

3

200

(15 - 5) x 10  + 3

103

200

20 + 45 x 2 ÷ 5

38

300

5 x 5 +1 = 30

5 x 5 + 1= 26 or 

5 x (5 + 1) = 30

300

121 - 5 + 1    

= 121 - 1 + 5 = 125 

可以這樣計算嗎? 為什麼 ?



不可以

121 - 5 + 1 = 117

300

12 - 8 ÷ 2 + 3

11

300

6 x 8 + ( 7 - 6 )

49

300

25 x 17 = 25 x (10 +___)

7

400

4 + 5 + 7 - 3 x 2 = 26

10 or

(4 + 5 + 7 - 3) x 2 = 26

400

25 - 5 + 10  =  25 - 15  = 10    Is it correct ? Why?


25 - 5 + 10  =  25 - 15  = 10    正確嗎 ? 為什麼 ?

Not correct. We cannot add 5 and10 first.

25 - 5 + 10 = 30

不正確.

400

20 ÷ (8-3) + 16 

20

400

( 10 + 19 -5 ) x 2

48

400

225 - 1 x 6 x 5 + 5

200

500

20 - 5 x 2 + 3 = 33

13 Or

20 + 5 x 2 + 3 =33  Or

(20 - 5) x 2 +3 = 33

500

May is going to buy 2 T-shirts and 2 dresses. 

One T-shirt is $25 and one dress is $100. How much is May going to pay ?


美美想買兩件 T-裇 和 兩條裙。一件T-裇 25元, 一條裙100元。問美美應付多少元?

$25 x 2 + $100 x 2 = $250  or

(25 + 100) x 2 = 250

500

7 + 3 x (8 ÷ 4)

13

500

2 x ( 9 x 9 + 2) - 8

158

500

(4 - 2x2) x 22 x (5x5 - 4x3)

0