MathCh2-AddingWholeNumbersandMoney

Friday 22 Problem of the Day If you had a banana, apple, orange, and a pear. You have to have two fruits. What combinations could you use? You can use a tree diagram or an organized list to solve the problem.

You can have 6 combinations with the fruit.

Lesson 2-1 __Mental Math (__adding) math calculations that you do in your head You can add numbers in any order- __Commutative Propety__ of __Addition__ ex. 5+7 or 7+5 You can change the grouping of numbers when you add- __Associative Propety__ of __Addition__ ex. (3+2)+8 = 3+(2+8) 5+8+13 or 3+10=13 The __sum__ is the answer in addition. 7+5=12 Addends (ex. 7 & 5) Sum (ex. 12)

1) __Breaking Apart__ ex. $145+$39 /\ 5+ 34 145+5=150 +34=184

2)__Compensation__ (making up for) $145+$39 145+40=185-1=184

ex.78+44 Breaking Apart or Compensation? Compensation 78+40=118+4=122 Breaking Apart 78+44 /\ 70+8 70+44=114+8=122

Spiral Review 2-2

__P 2-1__

1) 89+46=135 135-89=46 2) 301+61=362 362-61=301 3) 400+157=557 557-157=400 4) 722+158=880 880-722=158 5) 523+223=746 746-223=523 6) 804+396=1,200 1,200-804=396 7) 299+206=505 505-299=206 8) 878+534=411 411-878=534 9) 1,000+7,000=8,000 8,000-7,000=1,000 10) (52+8)+25=85 11) $1.65 change 98 into 100, 100+67=167-2=165 12) $1.27 change 82 into 80+45=125+2=127 or 13) B $4.00 $2.53+$3.47=$6.00 $10-$6=$4. 14) You would break apart the 303 into 302. Then you would add 678 to it. 678+302=980+1=981.

PS 2-1 1) 72 into 71 71+39=110+1=$111 2) $18+72=$90 3) 9 into 8+1 39+1=40+8=48 4) No, Mr. Iverson can't bye the basketball and net because it equals $27. 5) She would have to pay $528. 6) She would have to pay $268. 7)The most expensive Andrea can buy with her horse is the saddle and the boots. 8) I solved number five by using compensation metal math. This is what I did: I broke apart 149 into 130 130+379=509+19=528.

Tueday 26/10 Test taking practice

1)To make it easier to add, you would do this like this; (74+6)+5=85. 2) It would be C. I broke apart 73 into 70 70+85=155+3=158.

__Lesson 2 Mental Math- Subtracting__ 69-23=46 easy to do when there is no regrouping /\ 20+3 69-20=49-3=46 30-9 30-10=20+1=21 98-15 98-10=88-5=83 __Counting On__ 400-185 190 200 400 5+10+200=215 164-__94__ 94 100 164 6+64=70 164-94=70 check w/ addition 70+94=164 R 2-2 ex. 162-48 162-50=112+2=114 1)86-14=72 2)66-58=8 3)141-46=95 4)206-78=28 5)164-94=70 I solve the problem by doing this; I made 94 into 90 164-90=74-4=__70__

Wed. 27/10 Spiral Review 2-3

Thurs. 28/10 PS 2-2

__Estimating Sums and Diffrenence__ answer in + answer in - Estimate when you do **__not__** need an exact answer. When you see the word **about** you don't need to know the exact answer when you add or subtract. 2 ways to estimate (1) Using rounding (better way) ex. 1,248 1,200 to round to the addens +2,579 2,600 the add 3,800 ( 2) Front-end estimation (Mrs.Shami does not like it, so don't use it unless says so) 1,248 1,000 1,248+2,579=3,827 (real answer) 2,579 2,000 3,000

Fri. 29/10 PS 2-2 & PS 2-3

Mon. 11/1/10 Spiral Review 2-4

__Overestimate and Underestimate__ When an estimate is greater than the actual number, it is called an overestimate. When an estimate that is less than the exact number answer, it's called an underestimate.

ex. 825+346=1,171 800+300=1,000 est. underestimate ex. 4,825+2,517= 7,342 5,000+3,000=8,000 est. overestimate ex. 372+238=610 400+200=600 est underestimate ex. 575-138=437 600-100=500

Wed. 11/3

Spiral Review 2-5

Mon. 11/8

Spiral Review 2-6

__Adding Whole Numbers and Money__

Add 275+ 137 est. 280+140=420 __+137__ 412 1) estimate the sum 2) Write the addeds under each other, lining up the place values 3) Add the ones, regroup if necessary 4) Add the tens, regroup if necessary 5) Add the hundreds, regroup if necessary 6) Compare to actual to see if it makes sense

ex. 7,376+2,719= est. 17,000+3,000=10,000 __2,719__ 10,095add $36.25+$12.94 est. $40+$13=53

__11/9__

__Spiral Review 2-7__

__Wed. 11/10__

Subtracting Whole Numbers and Money __ex.415-3__7__7 377+38=415__ - 377 __38__ __420-380=40 est.__ __1) estimate__ __2) write the numbers under each other, lining up the place values__ __3) start at the ones, regroup if necessary__ __4) check with addition__

__ex. 504-278=__ __500-300=200__ __504__ -278 __+226__ 278 __504__

__11/11/10__ __1__)use mental math - (no regrouping) ex. 4,800-100= 2)pencil and paper (very litte regrouping) 16,375-11,125 3) calculator (lots of regrouping) 10,367+22,143+29,972

11/12/2010

11\15\10

11\16\10

Palindromes-words, sentences, or numbers that are the same written backword and frontward. ex.racecar, the year 2002, level pup, pop, dad, and mom

11\17\10

10+25 25 less 11 25-10 25-11 6 more than 25 25+6 25 decreased by 6 25-6 11 increased by25 11+25 14 combined with 2 14+2

11\18\10

Pia had $20 spent $7 earned ( $20-$7)+9 Paretheses-tell which operation in an equation to do first 12-(2+6)= 4 (12-2)+6=16

11\19\10

Evaluating Expressions variable-sybol that stands for a number z=17 variable dont use o t or l for the addition or subtraction like z=17

Expressions that have variables are called algebraic expressions ex X +8 if X=3 3+8=11 y-12 if y=42 42-12=30

m 32+m __l__ __4 l 36__ __7 l 39__ 12 l 44

11/22/10 Solving Addition and Subtraction Equation __equation-__ a number sentence that uses an equal sign to show that 2 expressions have the same value. ex.8+9=17 ex. 100- 40= 60 ex. x+3=7 ex, 7+3=4+6 ex. 7+3+2=5+5+2 __solution-__ to equation is the value of the variable that makes the equation true. ex.x +3= 7 equation ex. x =4 solution __Isolate__- your variable -keep it all by itself on one side of the equation. 11/23/10 Have a happy Thanksgiving!

11/29/10

11/30/10

12/2/10 Meanigs of Multiplication The numbers you multiply to get a product are called __factors__. The answer in multiplication is called the __product__. Multiplication is a short cut for addition. 6+6+6+6=24 When objects are arranged in equal rows, they are called arrays.

12/3/10 Arrays are the easier way to learn Multiplication. __Patterns in Multiplication__ Every time you skip count by two you end up with an even numbers. Every time you skip count by five you go odd, even, odd, even, and so on with the numbers. __Multiple__ - the product of any 2 whole numbers Is 8 a multiple of 2? Yes because there even number 4 x 2 = 8 __Multiplication Properties__ __Zero Property__- the product of any number and zero equals zero

Chapter 5 Multiplying by multiples of 10, 100, 1,000 3x4=12 3x40=120 3x400=1,200 3x4,000=12,000

ps 5-1 40 cups of whole wheat flour 160 cups of whole weat flour 400 cups of whole wheat flour

80 canines