Understanding how addition and subtraction relate to one another. SOL 2.10 Grade 2 Created by; Kim Smith For each addition fact there is a related subtraction fact? A. B. C. D. 25% 25% 25% 25% 25 No I don’t know Who cares Yes 1 2 3 4 5 6 7 21 22 23 24 25 26 27 8 9 10 11 12 13 14 15 16 17 18 19 20 When determining a missing number do we have to add or subtract? A. B. C. D. 25% 25% 25% 25% 25 No Yes I don’t know Maybe 1 2 3 4 5 6 7 21 22 23 24 25 26 27 8 9 10 11 12 13 14 15 16 17 18 19 20 What are the missing numbers in this sentence? 3+__=5 or __+2=5 A. B. C. D. 25% 25% 25% 25% 25 3,1 2,3 1,3 5,5 1 2 3 4 5 6 7 21 22 23 24 25 26 27 8 9 10 11 12 13 14 15 16 17 18 19 20 What are the missing numbers in this sentence? 5-__=3 or 5-2=__ A. B. C. D. 25% 25% 25% 25% 25 3,3 1,1 2,3 3,2 1 2 3 4 5 6 7 21 22 23 24 25 26 27 8 9 10 11 12 13 14 15 16 17 18 19 20 What are the missing numbers in this sentence? 6+__=10 or __+6=10 A. B. C. D. 25% 25% 25% 25% 25 3,3 2,2 4,4 6,6 1 2 3 4 5 6 7 21 22 23 24 25 26 27 8 9 10 11 12 13 14 15 16 17 18 19 20 What are the missing numbers in this sentence? 8-__=2 or 8-6=___ A. B. C. D. 25% 25% 25% 25% 25 6,2 3,1 8,8 8,2 1 2 3 4 5 6 7 21 22 23 24 25 26 27 8 9 10 11 12 13 14 15 16 17 18 19 20 What are the missing numbers in this sentence? 5-__=1 or 4+1=__ A. B. C. D. 25% 25% 25% 25% 25 4,5 3,2 3,3 4,4 1 2 3 4 5 6 7 21 22 23 24 25 26 27 8 9 10 11 12 13 14 15 16 17 18 19 20 What are the related facts for this addition problem? 3 + 4 =7 A. B. C. D. 25% 25% 25% 25% 25 7-2=5 and 7-5=2 7-3=4 and 7-4=3 7-6=1 and 7-1=6 3-4=7 and 4-3=7 1 2 3 4 5 6 7 21 22 23 24 25 26 27 8 9 10 11 12 13 14 15 16 17 18 19 20 What are the related facts for this addition problem? 6+5=11 A. B. C. D. 25% 25% 25% 25% 25 11-6=6, 11+5=16 11-5=6, 11-6=5 11+11=22, 11+22=33 11-5=6, 11-6=6 1 2 3 4 5 6 7 21 22 23 24 25 26 27 8 9 10 11 12 13 14 15 16 17 18 19 20 What are the related facts for this subtraction problem? 15-6=9 A. B. C. D. 25% 25% 25% 25% 25 9+6=15, 15-9=6 15-6=9, 15+6=21 15-9=6, 15-6=9 15+15=6, 15+15=30 1 2 3 4 5 6 7 21 22 23 24 25 26 27 8 9 10 11 12 13 14 15 16 17 18 19 20 What are fact families? 25 A. B. C. D. 25% 25% 25% 25% When all the numbers are related When all the numbers are different When you only use addition When you only use subtraction 1 2 3 4 5 6 7 21 22 23 24 25 26 27 8 9 10 11 12 13 14 15 16 17 18 19 20 What are the fact families for 10+3? 25 A. 10+3=13,3+10=13, 13-10=3,13-3=10 B. 10+3=10,10+3=10,10-3=7, 10-7=3 50% 50% 1 2 3 4 5 6 7 21 22 23 24 25 26 27 8 9 10 11 12 13 14 15 16 17 18 19 20