Grade 1 Mathematics Chapter 4: Addition and Subtraction Within 100
Student lessons | Daily practice | Teacher answers | Grade 1 home
Five original guided lessons. Read, demonstrate, discuss, and then complete matching exercises.
Day 1: Regroup Ones
Learn: To add two-digit and one-digit numbers, add the ones and regroup if ten or more ones are formed.
Worked example: 28 + 5 = 20 + 13 = 33.
Day 2: Subtract Across a Ten
Learn: When there are too few ones to remove, exchange one ten for ten ones. The number stays equal during the exchange.
Worked example: 32 – 5: exchange to make 2 tens and 12 ones, then take away 5. Result 27.
Day 3: Jump on a Number Line
Learn: Break a number into tens and ones. Jump forward for addition and backward for subtraction.
Worked example: 47 + 12: add ten to reach 57, then two to reach 59.
Day 4: Solve Word Problems
Learn: Find whether amounts join, leave, or are compared. Write an equation that matches the story.
Worked example: Twenty-six crayons plus eight new crayons gives 26 + 8 = 34.
Day 5: Independent Assessment
Learn: Work alone. Show your method for one question and check subtraction with addition.
Worked example: Check 41 – 8 = 33 by adding 33 + 8.
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