Missing Numbers
Find the number that fits
What if part of the sum is missing? Work backwards to find it!
7 + 3 = 10
7 + 5 = 12
8 + 7 = 15
A missing number sum has a gap. To find it, think: what do I add to get the answer? 7 + 3 = 10. Use your number bonds! This is the start of algebra — clever stuff!