What's My Rule?
Estimating Cost
Addition/ Subtraction Stategies
Graphs and Area
Multiplication and Equal Names
100
Rule: +2
In: 8
Out: ?
Out: 10
100
What is 168 rounded to the nearest 10?
170
100
Use Partial-Sums addition to add
54
+ 43
________
54+43=
50+40=90
4+3= 7
90+7=97
100
Use tallies to show how many goldfish there are
6 tallies
100
12= 1 ______
1 dozen
200
Rule: x3
In: 4
Out:?
Out: 12
200
What is 234 rounded to the nearest 10 and 100
230
200
200
Use count-up subtraction to solve the problem.
127-46=
Answer 81
200
How many candies does Sam and Julie have together?
14
200
Does 5x7 = 7x5
What is this rule?
How are the arrays different?
Yes
Commutative Property
one with have 5 down and 7 across
the other 7 down and 5 across
300
Rule: x2
In:?
Out: 6
In: 3
300
Estimate: 167+29=
Write number sentence.
170+30= 200
300
Is this correct?
248+187= 31215
What did the student do wrong?
What is the correct answer?
No, the student did not carry over the place values. The correct answer is 435.
300
If one box= 5 votes, create a picture graph
Apple Juice - 3 boxes
Pepsi- 2 boxes and a line
Coke- 3 boxes and 3 lines
Milk- 3 boxes and 2 lines
300
Write a number sentence for this array
3x4=12
or 4x3=12
400
Rule:?
In: 3, 5, 7
Out: 9, 15, 21
Rule: x3
400
Estimate: 83-35=
Write number sentence. Do the actual problem.
Does this answer make sense? Why or why not?
80-40=40
83-35=48
Yes, the numbers are very close. However 48 rounds up to 50 not 40.
400
Use the expand and trade method to solve
351
- 168
____________
300+50+1
100+6+8
___________
100+80+5=185
400
What is the area of this rectangle?
8x4=32
400
What is an example of a multiplication square? Draw an array to match.
Any number times itself. 52 or 5x5
Answers will vary
500
If my rule is to multiply by 3, and I am only given the out number, what do I need to do to get the in question? Why?
I need to divide by 3, I am using fact families.
Optional: Commutative Property
500
Tasha rounded this problem.
125+213=
200+200=400
Is she correct? Why or why not?
Tasha is not correct because 125 would round down to 100 not 200.
100+200=300
Real answer: 125+213= 338
500
In subtraction, why is it important to follow the rules with place value?
What can you do to make sure your answer is correct? (2 answers)
* If you do not follow place value rules, your answers will be wrong
* Estimate my answer first
*Add my answer and the lowest number together
* Use different methods to check
500
Write 10 ways to represent the number 20.
Include:
An array, a multiplication, addition, subtraction, and division problem, tallies, written out etc.
Answers will vary, need at least 10 different.
500
Sarah does not know the answer to 6x5, but she does know the answer to 5x5= 25, so she uses it as a helper fact. Sarah draws the array for 5x5=25
Draw the array and show how to find 6X5.
5x5 array with one more row added
25=5=30
6x5=30