Finding the unknown number
Answers are for parents and teachers.
1
Find the unknown: _ + 3 = 7; 5 + _ = 9; _ + 6 = 6
4, 4, 0
2
Find the unknown: _ − 4 = 5; 10 − _ = 2; _ − 1 = 8
9, 8, 9
3
Write the 4 facts for the family 3, 7, 10.
3 + 7 = 10, 7 + 3 = 10, 10 − 3 = 7, 10 − 7 = 3
4
Problem: There were some passengers on a bus. 5 got off at a stop and 4 stayed. How many were there before?
9
5
Problem: Lola had 8 pencils. She gave some to a friend and has 5 left. How many did she give?
3