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# Mental math and reflexes Unit 1.7 Square numbers

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## Ximena Melo

on 19 August 2016

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#### Transcript of Mental math and reflexes Unit 1.7 Square numbers

Mental Math and Reflexes Page 48
Play Beat the calculator.Half the class calculates mentally, and half uses calculators. Students stand up when they know the product. Have a representative from each team respond
3*7
6*4
8*8
3*9
9*9
4*8
8*3
7*8
8*4
6*7
9*6
8*9
7*6
9*7
6*9
8*7

Mental Math and Reflexes Page 53
Mental math and reflexes
5*6
3*9
7*7
6*6

9*5
7*8
6*7
9*6
8*6
6*9
7*6
6*8
7*9
8*7
9*7
8*9
Question
Which number could be represented by an array with the same number of rows and columns?
Draw it..............Model it
Draw a square next to the array.
How is a 4 by 4 array similar to a square?
When an array has the same number of rows and columns, it is shaped like a
square it is called a
SQUARE ARRAY
The number it represents is called a
square number

Can square arrays be drawn
for 1,2,3 and 4?
Draw the square array for the number 4
Draw a square around the array
Draw the square array for the number 1
How many objects are in the array?

Hoy many rows are in the array set?

How many columns are in the array set?

Ok
Write the multiplication number model that represents this array.

Because we can answer these questions in the same manner for any square array, we consider the single dot for 1 to be a square array
A complete listing of square arrays starts with an array that has 1 row and 1 column, each containing one dot.

The second square array has two rows and two columns, each containing two dots.

How many rows and how many columns does the third square array have?

Draw it .......model it
Numbers that can be represented by square arrays are called
square numbers
The first square number is 1, the second square number is 4. What is the third and fourth square numbers?

DRAW THEM MODEL THEM
Exercise
Math journal page page 20 and 21
Agenda
1. Quiz of divisibility
2. HW review
3. Mental math
4. Math master page 17
5. Presentation
6. Practice math journal pages 20 and 21
7. Closing
8. Homework math boxes pages 15 and 16
Goal: To introduce square numbers and exponent key
Full transcript