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Grandma has 13 plates with 21 cookies on each plate.  How many cookies does Grandma have?

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Grandma has 13 plates with 21 cookies on each plate.  How many cookies does Grandma have?

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Use pictures, numbers and/or words to solve this problem in at least two ways.

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10 plates of 21 cookies is 210 and 3 additional plates would be 63. 210 plus 63 is 273

13 plates of 20 cookies is 260 plus 13 more would be 273

Courtney Rios

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Dianna Ramirez

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(A)
13 x 10 = 130
130 x2 = 260
260+ 13(1) = 273

(B)
13 x 20 = 260
260+ 13 = 273

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10 x 21 = 210
3 x 21 = 63
13 x 21 = 273

13 x 20 = 260
13 x 1 = 13
260 + 13 = 273

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(10+3)*(20+1)
10*20 + 10*1 + 3*20 + 3*1
200+10+60+3 = 273

Alondra

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1. I first pictured 13 plates with 21 cookies stacked, so I drew 13 plates and 21 dots on each. I added up sets of 21, then 42, then 84

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Second way
13X20=260 then 260+13=273

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13 x 21=273 I took 13 plates and 21 cookies on each plate and multiplied them.
10x21= 210, 3x21= 63, 13x21=273

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13 plates with 21 cookies on each

1.    13
x. 21
__________
13
+  260
________
273 cookies

2.
13 = 10 + 3
21 x 10 = 210
21x 3= 63

210 + 63= 273 cookies

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13x21+273.
Add 21, 13 times and your answer is 273. C.H
21+21+21+21+21+21+21+21+21+21+21+21+21=273

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2) 21= 20 + 1
20= 2 x 10
13 x 2 = 26 x 10= 260

13 x 1 = 13

260 + 13 = 273

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1. 20x13=360
13 left
360+13= 273

2. 10x21=210
3x21=63
210+63=273

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21+21+21+21+21+21+21+21+21+21+21+21+21=273

(10+3) x (20X+1)
200+10+60+3
273

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1.
10 x 21= 210
3 x 21= 63
210+63= 273

2.
5 x 21=105
5 x 21=105
3 x 21=63
105+105+63= 273

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13x10=130
13x10=130
100+100+30+30=260
260+13=273

5x21=105
5x21=105
3x21=63
105+105+63=273

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Grandma = G
Plates = P
Cookies = C

G=13p x 21c
G= 273c