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Fact Families
What's My Rule?
Number Stories
Partial-Sums Algorithm and Subtraction
Adding Three or More Addends
100
Name the turn-around fact for 7+8=15.
What is 8+7=15?
100
If 50 is dropped into this function machine, which number will come out?
What is 100?
100
Two snakes hatched eggs. One snake laid 43 eggs. The other had 58. How many eggs were there in all? Draw a part-part-total diagram to show this problem. Solve the problem and write a number model.
What is 101 eggs?
100
63+24=? Make a ballpark estimate and write a number model to show your estimate.
What is 60+20=80?
100
The ostriches at the zoo had 4 clutches this year. They laid 15 eggs, 8 eggs, 6 eggs, and 12 eggs. How many eggs were laid in all? Solve and write a number model.
What is 15+8+6+12=41 eggs?
200
Name the four facts that can be written using 8, 9, and 17.
What are: 8+9=17? 9+8=17? 17-9=8? 17-8=9?
200
Complete the out column.
What is 10, 16, 26, 38?
200
Jenny had $44 in her bank account. She deposited another $23. How much money is in her bank account now? Draw a change diagram, solve the problem, and write a number model.
What is $67? 44+23=67.
200
145+322=? Use the partial-sums method to solve. Show your work.
What is 467?
200
Over the summer, 4 children read a total of 33 books. One child read 6 books. Another child read 12 books. A third child read 9 books. How many books did the fourth child read? Solve and write a number model (or number models) to show how you solved the problem.
What is 6 books? 6+12+9=27 33-27=6
300
Is there a turn-around rule for subtraction? Why or why not?
What is no? For example, 17-8=9, but 8-17=-9.
300
Complete the in and out columns.
What is 88, 92, 60, 51, 32?
300
George had $80 to spend at the mall. When he got home, he only had $31. How much money did he spend? Draw a change diagram, solve the problem, and write a number model.
What is $47? 80-31=47.
300
459+168=? Solve using the partial-sums method. Show your work.
What is 627?
300
Lori has $3.50 for snacks at the snack bar. On the first day, she buys candy for 50 cents. On the second day, she buys french fries for $1.25. How much money does she have left to spend on the third day? Solve the problem and write a number model.
What is $1.75? 0.50+1.25=1.75 3.50-1.75=$1.75
400
Write the number family for 76, 23, and 99.
What is: 76+23=99 23+76=99 99-23=76 99-76=23
400
What is the rule? Fill in the blanks.
What is subtract 20? 25, 100.
400
The normal high temperature in a city is 76 degrees. The normal low is 17 degrees. What is the difference between the normal high and low? Draw a comparison diagram, solve the problem, and write a number model.
What is 59 degrees? 76-17=59.
400
283-156=? Solve using the counting up (or number line) method. Show your work.
What is 127?
400
150+215+300+50=??
What is 715?
500
Make up and draw a fact triangle and list the number family that goes with it.
Answers vary.
500
What is the rule? Fill in the blanks.
What is double (or x2)? 4, 15.
500
The difference between the high and low temperatures of a certain city is 33 degrees. The high temperature is 82. What is the low temperature? Draw a comparison diagram, solve the problem, and write a number model.
What is 49 degrees? 82-33=49.
500
826-172=? Solve using the counting up (or number line) method. Show your work.
What is 654?
500
175+220+300+25+200=??
What is 920?