Fact Extensions
Number Stories
Partial Sums
Ballpark Estimates
Subtraction
100
If 3 + 6 = 9....What is 300 + 600?
900
100
Mr. Sands bakes 12 cakes on Saturday. He then baked 13 cakes on Sunday. How many cakes did he bake in all?
25 cakes.
100
35 + 23
58. 30 + 20 = 50 5 + 3 = 8 50 + 8 = 58
100
48 + 95
Answers Vary 50 + 100 = 150
100
88 - 45
43
200
If 9 + 7 = 16.... What is 90 + 70 and 900 + 700?
160 and 1,600
200
Mr. D started the year with 150 balls in the gym. During the year he lost 75 balls. How many balls does he have now?
75 balls.
200
320 + 450
770 300 + 400 = 700 20 + 50 = 70
200
105 + 248
100 + 250 = 350
200
154 - 32
122
300
If 8 - 5 = 3... then what is 800 - 500?
300
300
Simon's house is 30 feet tall. Calvin's house is only 18 feet tall. How much taller is Simon's house than Calvin's?
12 feet taller.
300
321 + 448
769 300 + 400 = 700 20 + 40 = 60 1 + 8 = 9
300
379 - 113
400 - 100 = 300
300
95 - 49
46
400
If 8 + 7 = 15....what is 38 + 7?
45
400
Mr. Henry, Ms. Leeper and Mrs. Pooler added up their students that had detention that day. Mr. Henry had 13 students who had detention, Ms. Leeper had 9, and Mrs. Pooler had 7 students. How many students had detention total?
29 students.
400
583 + 375
958 500 + 300 = 800 80 + 70 = 150 3 + 5 = 8
400
658 - 345
650 - 350 = 300
400
345 - 128
217
500
If 2 + 9 = 11...then what is 122 + 9.
131
500
Brady had 38 Dojo points. Sophia had 52 Dojo Points. How many more does Sophia have than Brady?
14 more points.
500
215 + 854
1,069 200 + 800 = 1,000 10 + 50 = 60 5 + 4 = 9
500
334 + 893
350 + 900 = 1,250
500
405 - 276
129