This hard worksheet stretches kindergartners with the trickiest sums and missing-addend puzzles in the topic. Children weigh multiple-choice options for facts like 5 + 8, 9 + 9, 4 + 9, and 7 + 6, sharpening recall of the doubles and near-doubles that anchor mental math. Each question rewards careful checking instead of quick guesses.

Then the missing-addend section asks them to solve puzzles like ___ + 6 = 17, 9 + ___ = 15, 8 + ___ = 14, and ___ + 9 = 18, training the algebraic thinking that subtraction will soon demand. This sheet turns confident kindergartners into ready-for-first-grade young mathematicians.