### Other Examples:

- Asked, "You have some balls, then you get 4 more balls, now, you have 9. How many did you start with?," counts, putting up fingers: "Five, six, seven, eight, nine." Looks at fingers, and says, "Five!"

### Help your student become a(n) Numbers-in-Numbers +/-

These activities challenge children to solve all the addition and subtraction problem types they have already learned to solve and the very difficult Join and Separate start unknown problem type ("You had some cars and then you got 5 more, now you had 12. How many did you have to start with?"). Such activities benefit from discussions "parts" and "wholes." Children continue to build and use sophisticated strategies, including seeing numbers as part of other numbers and using more well-known combinations (e.g., "5 and 5 is 10, so…").