Show:
Fact Families
Addition
Subtraction
Find the Rule
Other
100
What is the fact family for 2, 4, 6
2+4=6 4+2=6 6-2=4 6-4=2
100
Do the following addition problem with the mental math stategy I taught you. 16+23=
39
100
Count on to find the difference. 16-12=
4
100
In 4 9 1 3 Out 7 12 4 6
The rule is add 3
100
Finish this problem (2+4)+___=2+(__+3)
(2+4)+3=2+(4+3) Associative Property
200
What is the fact family for 6, 9, 15?
6+9=15 9+6=15 15-9=6 15-6=9
200
27+71=
98
200
69-50
19
200
In 4 9 11 15 Out 1 6 8 12
The rule is subtract 3
200
14+0=____
Identity Property 14
300
What is the fact family for 9, 11, 20
9+11=20 11+9=20 20-11=9 20-9=11
300
83+7=
90
300
60-45=
15
300
In 15 3 8 20 Out 18 6 11 23
Add three
300
What property is this? 6+7=7+6
Commutative Property
400
What is the fact family for the numbers 12, 14, 26
What is 12+14=26 14+12=26 26-14=12 26-12=14
400
42+14=
56
400
100-72=
28
400
In 6 12 15 9 7 Out 0 6 9
9 7 3 1 The rule is subtract 6
400
What is the number sentence for the following sentence? Katie planted 4 sunflower seeds and 10 daisy seeds. How many seeds did she plant altogether?
Katie planted 14 seeds.
500
Finish this fact family
20+30=50 30+20=50 50-30=20 50-20=30
500
Explain what you do when you break the number up by digits. Can you do this when the ones is over 9?
Yes. Take a look 16+15....that would be 2 tens and 11 ones. Then add 20+11. It equals 31.
500
15-0=
15
500
In 10 11 15 17 8 1 Out 21 22 26 28
The rule is add 11 8 1 29 12
500
Explain your answer to this word problem. The first team got 8 questions right on jeopardy and the second team got 11 questions right. About how many questions did they answer correctly?
I rounded 8 to 10 and 11 to ten because they problem said about how many questions were correct. This means I have to add estimated numbers.