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4-1
4-2
4-3
4-5
Butterfly Standards
100

30 X 40 

1200

100

Draw and area model to find 20 x 26



420 

Split 20 into 10 + 10 

Split 26 into 20 + 6

100

Estimate product

39 x 19

800 

100

Draw an area model to find product

41 x 12

Teacher will check 

492

100

34x51

1734

200

500 X 3

1500

200

10 x 22

220

22 into 20 + 2

200

Estimate the product

28 x 27

900

200

Draw an area for each product 

29x 50 


1,450

Teacher will check the array

200

19 x 52

988

300

40 x 600

24,000

300

20 x 35

700

Split 30 into 30 + 5

300

Estimate each product 66 x 41

2,800

300

Draw an area for product 

22x88


1,936

Teacher will check the array

300

38 x 17

646

400

10 x 1600

16,000

400

Which is greater 15 x 30 or 22 x 20

30 x 15

400

Estimate the product 

34 x 52

1,500

400

Draw an area model to find product 

58 x 19

1,102 

Teacher will check the array

400

73 x 81

5,913

500

240,000 x 200

48,000,000

500

Draw an array to find the product of 40 x 21

Teacher will check 

500

Select all of the expressions that could be used to estimate 32 x 14

30x10

30x20

14x32

32x10

30x10

32x10

500

Select all the partial products to find 19x26

45; 60;180;200

200;180;60;54

6;45;180;200

200;60;180;54

200;180;60;54

200;60;180;54

500

26 x 53

1,378