Solve using unit form 1
2a. 19 x 50
(complete the entire problem and try your best to draw the tape diagram)
19 fifties
20-1 = 19
(20-1) x 50
(20 x 50) - (1 x 50)
1000 - 50
950
3b. 11 x 31
(complete the entire problem and try your best to draw the tape diagram)
31 elevens
30 + 1 = 31
11 x (30 + 1)
(11 x 30) + (11 x 1)
330 + 11
341
2b. 11 x 26
(complete the entire problem and try your best to draw the tape diagram)
11 twenty-sixes
10 + 1 = 11
(10 + 1) x 26
(10 x 26) + (1 x 26)
260 + 26
286
3c. 19 x 11
(complete the entire problem and try your best to draw the tape diagram)
19 elevens
20 - 1 = 19
(20 - 1) x 11
(20 x 11) - (1 x 11)
220 - 11
209
2c. 49 x 12
(complete the entire problem and try your best to draw the tape diagram)
49 twelves
50-1 = 49
(50-1) x 12
(50 x 12) - (1 x 12)
600 - 12
588
3d. 50 x 13
(complete the entire problem and try your best to draw the tape diagram)
13 fifties
10 + 3 = 13
50 x (10 + 3)
(50 x 10) + (50 x 3)
500 + 150
650
2d. 12 x 25
(complete the entire problem and try your best to draw the tape diagram)
12 twenty-fives
10 + 2 = 12
(10 + 2) x 25
(10 x 25) + (2 x 25)
250 + 50
300
4. How can 12 x 50 help you find 12 x 49?
So I can find 12 x 49 by rewriting it as 12 x (50 - 1)
After finding (12 x 50) - (12 x 1), I am just finding 50 copies of 12 and subtracting 1 copy of 12 to find 12 x 49.
3a. 29 x 12
(complete the entire problem and try your best to draw the tape diagram)
29 twelves
30 - 1 = 29
(30-1) x 12
(30 x 12) - (1 x 12)
360 - 12
348
7. The Lason School turns 101 years old in June. In order to celebrate, they ask each of the 23 classes to collect 101 items and make a collage. How many total items will be in the collage? Solve the problem using the steps we have practiced in this lesson.
23 x 101
100 + 1 = 101
23 x (100 + 1)
(23 x 100) + (23 x 1)
2300 + 23
2323