About This Lesson
More or less than questions and answers. Runs on a 5 min timer. Ideal warm up; practice or assessment. Aligned with Common Core State Standards: 1.NBT.5, 1.NBT.6, Number and Operations in Base Ten.
Grade Level
Grades K-2
Resource Type
Handout, Worksheet
Standards Alignment
Common Core State Standards
License
Standards
Given a two-digit number, mentally find 10 more or 10 less than the number, without having to count; explain the reasoning used.
Subtract multiples of 10 in the range 10–90 from multiples of 10 in the range 10–90 (positive or zero differences), using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method and explain the reasoning used.
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Great activity that gets students fluent with numbers.