One Less One Greater Worksheet
Use this One Less One Greater Worksheet to help 1st grade students find the numbers that come just before and just after, up to 120. An answer key is included for quick, confident checking.
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About this resource
Description
Knowing the number that comes just before and just after is a big step in first grade number sense. This One Less One Greater Worksheet gives children focused practice finding one less and one more for numbers up to 120. The numbers are chosen on purpose: several of them sit right at a ten, such as 60, 89 and 100, so students have to think about what happens when the ones digit rolls over or rolls back. That is exactly where young counters tend to slip, and it is the part of counting to 120 that most needs practice.
The worksheet has two parts. Part 1 is a clear chart with three columns, One Less, Number and One More. Each row shows a number in the middle, and students write the number that is one less on the left and one more on the right. Part 2 has four short number sentences, such as “1 more than 79 is,” with a box for the answer, so children practice the same idea in words. Model the first row together on a number line or hundred chart, then let students work on their own and check with the answer key.
What’s Included
- A one less, one more chart with five numbers up to 120
- Four “1 more than” and “1 less than” number sentences
- A complete answer key
Why It Helps Kids
First, it builds a strong sense of how numbers are ordered, which supports counting, comparing and adding. Second, the numbers that cross a ten or reach 100 and beyond stretch children past easy counting into real place value thinking. Third, moving between a chart and number sentences helps students understand the words more and less, not just the pattern.
Ideas for Teachers and Parents
Hand out a hundred chart and let children point to each number and its neighbors before they write. Play a quick “before and after” game at the door or in the car with any number you call out. Use this 1st grade counting worksheet as a warm-up or exit ticket, and pair the one less one greater worksheet with a ten more, ten less sheet for a full place value review.
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