Answer: 4
Step-by-step explanation:
One way to do this is 19-15 which equals to 4. you can double check your answer by adding 4 to 15 which still equal 19. Seeing sum in a question usually means it's an addition question
so the number is 4
(I think :3 )
Answer: 4
Step-by-step explanation:
You can find the answer by doing the inverse (opposite) of addition (we're adding because it says sum) which is subtraction. So do 19-15 to get 4. To check, put 4 into the equation- does 4+15=19? It does! So the answer is 4 : )
