A set of 40 cards with number bonds to 100 on. Ask children to match the number bonds and cover them with counters. Which number doesn't have a partner?
 
Although all of the cards focus on numbers that add up to 100, some have different amounts of numbers on (9, 11, 13 or 21), making some cards more challenging. There are also a few cards that only include multiples of ten (30 and 70, for example) so an easier option. Something for everyone!