Learning Resources POP Games POP for Addition & Subtraction. Reach into this gumball themed game box to help children improve their addition and subtraction skills! This Learning Resources best selling POP game features bubblegum shaped cards that feature the 90 maths facts. Children simply pick a card from the box before answering the maths facts. If they solve the sums correctly they get to keep the card. The extra ‘POP’ cards keep children on their toes. This award-winning fast paced game promotes fluency. Numeracy game features two levels of play to extend the learning. Suitable for ages 6+.