Grade 1 Mathematics Weeks 17–18: Student Textbook
Ten lessons with concrete models, guided reasoning, and independent application. Use counters, base-ten blocks, equal-size cubes, paper clocks, and drawings as appropriate.
Week 17: Place value to 120
Day 81: Tens and ones
Learn: Draw tens rods and ones.
Example: Write 47 as tens and ones. Explain the answer using objects or a drawing.
Guided question: Write 48 as tens and ones.
Day 82: Expanded form
Learn: Draw tens rods and ones.
Example: Write 63 as tens and ones. Explain the answer using objects or a drawing.
Guided question: Write 64 as tens and ones.
Day 83: Ten more
Learn: Add one ten.
Example: What is 10 more than 58? Explain the answer using objects or a drawing.
Guided question: What is 10 more than 59?
Day 84: Ten less
Learn: Remove one ten.
Example: What is 10 less than 72? Explain the answer using objects or a drawing.
Guided question: What is 10 less than 73?
Day 85: Compare two-digit numbers
Learn: Compare tens, then ones.
Example: Compare 68 and 75: which is greater? Explain the answer using objects or a drawing.
Guided question: Compare 69 and 76: which is greater?
Week 18: Add and subtract multiples of ten
Day 86: Add tens
Learn: Use counters or make a ten.
Example: 30 + 40 = ___ Explain the answer using objects or a drawing.
Guided question: 31 + 41 = ___
Day 87: Subtract tens
Learn: Show a subtraction drawing.
Example: 90 – 50 = ___ Explain the answer using objects or a drawing.
Guided question: 91 – 51 = ___
Day 88: Ten more from any number
Learn: Add one ten.
Example: What is 10 more than 46? Explain the answer using objects or a drawing.
Guided question: What is 10 more than 47?
Day 89: Ten less from any number
Learn: Remove one ten.
Example: What is 10 less than 85? Explain the answer using objects or a drawing.
Guided question: What is 10 less than 86?
Day 90: Place-value checkpoint
Learn: Draw tens rods and ones.
Example: Write 94 as tens and ones. Explain the answer using objects or a drawing.
Guided question: Write 95 as tens and ones.