I would like to share with all of you a table with frequent addition and subtraction model situations that second and third grade teachers are using with the students for problem solving. It is important that our students be exposed to the comparative language in Math as well as they need to understand the meaning and how the vocabulary is related with the operation used depending also of the context situation. I am not saying that we need to teach key words. It is a great pedagogy mistake and it does not help the students to develop their thinking skills.
Me gustaría compartir con todos ustedes una tabla con situaciones frecuentes de modelos de suma y resta que los maestros de segundo y tercer grado están usando con los estudiantes para resolver problemas. Es importante que nuestros estudiantes estén expuestos al lenguaje comparativo en matemáticas, así como también que entiendan el significado y cómo se relaciona el vocabulario con la operación utilizada, dependiendo también de la situación del contexto. No digo que tengamos que enseñar palabras claves. Es un gran error pedagogco y no ayuda a los estudiantes a desarrollar sus habilidades de pensamiento.
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Result Unknown
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Change Unknown
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Start Unknown
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Add
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Last year, Mrs. Rojas bought 235 math books. This year she buys 548
more books. How many math books does she have now?
235 + 548 = ?
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Last year, Mrs. Rojas bought 235 math books. This year she bought some
more. She now has 783 math books. How many books did she buy this year?
235 + ? = 783
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Last year, Mrs. Rojas bought math books. This year she buys 548 more
books. She now has 783 math books. How
many books did she buy last year?
? + 548 = 783
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Take
Away
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520 pencils were in a box. I used
128 pencils. How many pencils are in the box now?
520 – 128 = ?
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520 pencils were in a box. I used some pencils. Then there were 392
pencils. How many pencils did I use?
520 - ? = 392
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Some pencils were in a box. I used 128 pencils. Then there were 392
pencils. How many pencils were in the box?
? – 128 =
3 92
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Total Unknown
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Addend Unknown
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Both Addends Unknown
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Put Together / Take Apart
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120 third graders and 103 second graders are in the cafeteria.
How many students are in the cafeteria?
120 + 103 = ?
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223 students are in the cafeteria. 120 are third graders and the rest
are second graders. How many students are second graders?
120 + ? = 223 , 223 – 120 = ?
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There are 223 students in the cafeteria. How many students can be
second graders and how many can be third graders?
Variety of answers
120 + 103 = 223
100 + 123 = 223 , etc
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Difference Unknown
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Bigger Unknown
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Smaller Unknown
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Compare
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How many more version
Luis has 345 soccer cards. Kenneth has 544 soccer cards. How many
more soccer cards does Kenneth have
than Luis?
How many fewer version
Luis has 345 soccer cards. Kenneth has 544 soccer cards. How many
fewer soccer cards does Luis have than Kenneth?
345 + ? = 544 , 544 – 345 = ?
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Version
with more
Kenneth has 199 more soccer cards than Luis. Luis has 345 soccer cards.
How many soccer cards does Kenneth have?
Version
with fewer
Luis has 199 fewer soccer cards than Kenneth. Luis has 345 soccer
cards. How many soccer cards does Kenneth have?
345 + 199 = ? , 199 + 345 = ?
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Version
with more
Kenneth has 199 more soccer cards than Luis. Kenneth has 544 soccer
cards. How many soccer cards does Luis have?
Version
with fewer
Luis has 199 fewer soccer cards than Kenneth. Kenneth has 544 soccer
cards. How many soccer cards does Luis have?
544 -199 = ? , ? + 199 =544
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