Session 1.2.

 Show 37 stickers. Use strips of 10 and singles.  Show 51 stickers. Use strips of 10 and singles.

 = ◦ What number did we add to 27? ◦ What was the sum? ◦ Which digit changed?  37+10= ◦ What number did we add to 27? ◦ What was the sum? ◦ Which digit changed?  47+10=

 1- a. Victor had 82 stickers. He gave 10 to his best friend Noah. How many stickers did Victor have then ?  b. Later, Victor gave 20 stickers to his brother and 20 stickers to his sister. How many stickers does Victor have now?

 2- Maria had 46 stickers. She went to Sticker Station and bought 3 more strips of 10 and 2 singles. How many stickers does Maria have now?

 3- Danny had 87 stickers. He gave 35 stickers to his little brother. How many stickers does Danny have now?

 4- Ari had 63 baseball cards. His mother gave him her collection of 26 cards. How many baseball cards does he have now?

 5- Ms. Ruiz’s students baked 75 muffins for the bake sale. They sold 53. How many muffins did they have left?

 6- Alex had 72 stickers. He went to Sticker Station and bought 4 strips of 10 and 7 singles. How many stickers does he have now.

 7- Deonte counted 47 squirrels on Saturday at the park. He went back on Sunday and counted 42 more. How many squirrels did he count in all?

 1- Vanessa went to Sticker Station and bought 6 strips of 10 and 3 single star stickers, and 2 strips of 10 and 9 single moon stickers. How many stickers did Vanessa buy in all? Session 1.3

 2- The third and fourth grade students from Lincoln School went to see a mask exhibit at the local art museum. They saw 54 masks from Africa and 32 masks from South America. How many masks did they see in all? Session 1.3

 3- Carlos had 58 basketball cards. His friend Marcus gave him 36 more. How many basketball cards does he have now? Session 1.3