Videos, examples, solutions, and songs to help Grade 1 kids learn how when given a
two-digit number, mentally find 10 more or 10 less than the number,
without having to count; explain the reasoning used.
Lessons for Grade 1
Common Core for
Common Core: 1.NBT.5
Suggested Learning Target
- I can mentally find 10 more for any two-digit number (e.g., 32
+ 10 = 42)
- I can mentally find 10 less for any two-digit number (e.g., 32
- 10 = 22)
- I can explain why the tens digit increase or decreases by 1
when 10 is added or subtracted.
- I can use base ten manipulatives, number lines or hundreds
charts to model finding 10 more and explain reasoning
- I know the addition and subtraction fact families
- I know how to model addition using base ten manipulatives
(e.g., base ten blocks, Digi-Blocks, Unifix cubes) and explain
- I know how to skip count by 10
Adding 10 To A Number
Adding 10 to a number using repeated examples.
86 + 10
33 + 10
34 + 10
7 + 10
75 + 10
20 + 10
62 + 10 ...
1 More/Less and 10 More/Less with 100 Chart
With the use of a hundred chart, identify one more than, one less
than, 10 more than, and 10 less than a given number.
Ten More Ten Less from the number chart
Encourage students to look for and discuss patterns on their
personal copy of the hundreds chart. Guide the students to realize
the vertical plus ten and minus ten patterns.
10 more than and 10 less than move back and forth
1 more than and 1 less than move side to side.
Math: Ten More Than a Number
Watch a teacher teach a small group of students how to count on 10
more than a number.
10 more and 10 less
Learning how to count by 10.
Adding and subtracting by changing the numbers in the tens column.
How do I help my child with 10 more and 10 less?
Working on fluency of 10 more and 10 less with Happy Counting
Try the free Mathway calculator and
problem solver below to practice various math topics. Try the given examples, or type in your own
problem and check your answer with the step-by-step explanations.
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