Number Jumpers WorksheetNumber Jumpers One More & One Less within 20 Name: Date: Reference Number Track Hop forward (+1) • Hop backward (−1) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Part 1 • Addition Statement Hop 1 step forward (+1) What is 1 more than 8? Start at 8 → add 1 Visual Model: 8 dots + 1 more 1 2 3 4 5 6 7 8 +1 Count all dots to find the total. Answer Sentence: 1 more than 8 is Addition Equation: 8 + 1 = Part 2 • Subtraction Statement Hop 1 step backward (−1) What is 1 less than 15? Start at 15 → subtract 1 Visual Model: 15 dots − 1 dot × Count how many dots are left uncrossed. Answer Sentence: 1 less than 15 is Subtraction Equation: 15 − 1 = Quick Rule: 1 more is counting forward (+1). 1 less is counting backward (−1). How did you do?