Math from class 3MR

Addition

100

(easy) 5+15

20

200

(ok)15+15

30

300

(Medium)100+15

115

400

(alright) 1,000+500

1,500

500

(hard) 2,000+5,500

7,500

Multiplication

100

(easy)1x5

5

200

(ok)2x15

30

300

(medium)2x30

60

400

(alright)5x100

500

500

(hard)20x100

2,000, or 20000

Subtraction

100

(easy)5-20

15

200

(ok)2-25

23

300

(medium)20-40

20

400

(alright)20-15

trick question lol 0

500

(hard)100-1,000

ez 900

Division

100

(easy)1 devided by 15

15

200

(ok)5 devided by 25

5

300

(medium) devided by 5

3

400

(alright)20 devided by 40

2

500

(hard)100 devided by 500

2 / 0.2 0_0

How to solve?

100

John has 5 apples. Someone gave him more. He has 15 now. How many did he get, and how do you solve?

He got 10 apples. To solve this: count by 5's

200

If you had 10 action figures, and someone gave me 15 more, how many would I have? 

25. count by 15 or 10+10+5

300

I had 100 paperclips and someone gave me 20 more. How many do I have?

120. Solve by getting 100 and counting by 20, 1 time