Ten topsy-turvy mice teach simple addition in this charming math picture book. Each spread features an equation showing one way to add up to ten, while the acrobatic mice split into two groups representing the numbers in the sum. 9 mice tidy. 1 mouse somersaults. 9 + 1 = 10. Some mice mop and scrub, while others spin and clown around. 8 mice cook. 2 mice juggle. 8 + 2 = 10. Look out as they swing and tumble! 7 mice wash. 3 mice spin. 7 + 3 = 10. All the mice are busy as they act out different ways to make the same sum.