Grade 1 Mathematics Weeks 11–12: Teacher Guide and Keys
Use concrete objects before drawings and equations. Discuss strategies, then assign independent practice. Record misconceptions privately.
Day 51: Add within 20
Model with counters or a ten-frame before independent practice. Model: 8 + 7 = 15. Make ten: 8 + 2 + 5 = 15.
Practice 1: 6 + 7 = ___ Answer: 13.
Practice 2: 9 + 5 = ___ Answer: 14.
Practice 3: 8 + 8 = ___ Answer: 16.
Practice 4: 7 + 4 = ___ Answer: 11.
Guided answer: 17. Ask the learner to explain independently; use a new problem to confirm transfer.
Day 52: Make ten
Model with counters or a ten-frame before independent practice. Model: 9 + 6 = 15 because 9 + 1 + 5 = 15.
Practice 1: 9 + 4 = ___ Answer: 13.
Practice 2: 8 + 6 = ___ Answer: 14.
Practice 3: 7 + 5 = ___ Answer: 12.
Practice 4: 9 + 9 = ___ Answer: 18.
Guided answer: 15. Ask the learner to explain independently; use a new problem to confirm transfer.
Day 53: Subtract within 20
Model with counters or a ten-frame before independent practice. Model: 16 – 7 = 9. Take away six to reach ten, then one more.
Practice 1: 15 – 6 = ___ Answer: 9.
Practice 2: 13 – 5 = ___ Answer: 8.
Practice 3: 18 – 9 = ___ Answer: 9.
Practice 4: 12 – 7 = ___ Answer: 5.
Guided answer: 9. Ask the learner to explain independently; use a new problem to confirm transfer.
Day 54: Unknown addend
Model with counters or a ten-frame before independent practice. Model: 7 + ___ = 12. Count on from seven to twelve: five more. The missing addend is 5.
Practice 1: 9 + ___ = 16 Answer: 7.
Practice 2: ___ + 5 = 12 Answer: 7.
Practice 3: 6 + ___ = 15 Answer: 9.
Practice 4: ___ + 8 = 17 Answer: 9.
Guided answer: 6. Ask the learner to explain independently; use a new problem to confirm transfer.
Day 55: Mixed facts
Model with counters or a ten-frame before independent practice. Model: 12 – 6 = 6. Check: 6 + 6 = 12.
Practice 1: 7 + 8 = ___ Answer: 15.
Practice 2: 16 – 9 = ___ Answer: 7.
Practice 3: 5 + ___ = 13 Answer: 8.
Practice 4: 18 – 6 = ___ Answer: 12.
Guided answer: 6. Ask the learner to explain independently; use a new problem to confirm transfer.
Day 56: Tens and ones
Model separately, before independent practice: Build 65 as six tens and five ones. Six groups of ten plus five single counters total 65.
For adults: check the four numbered items against the matching student practice. Accept correct equivalent explanations, drawings and wordings. Reteach using fresh numbers rather than repeating these questions.
Practice 1: Write 62 as tens and ones. Answer: 6 tens and 2 ones.
Practice 2: What number is 7 tens and 4 ones? Answer: 74.
Practice 3: How many tens are in 50? Answer: 5 tens.
Practice 4: Show 39 as a sum of tens and ones. Answer: 30 + 9.
Day 57: Compare two-digit numbers
Model separately, before independent practice: Compare 63 and 67. Both have six tens; three ones are fewer than seven, so 63 < 67.
For adults: check the four numbered items against the matching student practice. Accept correct equivalent explanations, drawings and wordings. Reteach using fresh numbers rather than repeating these questions.
Practice 1: 48 __ 53: write <, >, or =. Answer: <.
Practice 2: 72 __ 67: write <, >, or =. Answer: >.
Practice 3: 55 __ 55: write <, >, or =. Answer: =.
Practice 4: Which is greater, 89 or 98? Answer: 98.
Day 58: Ten more and ten less
Model separately, before independent practice: Starting at 64, ten more is 74 and ten less is 54. Show each with ten-blocks.
For adults: check the four numbered items against the matching student practice. Accept correct equivalent explanations, drawings and wordings. Reteach using fresh numbers rather than repeating these questions.
Practice 1: What is ten more than 43? Answer: 53.
Practice 2: What is ten less than 67? Answer: 57.
Practice 3: Write ten more and ten less than 82. Answer: 92 and 72.
Practice 4: A chart shows 54. Move one row up (ten less). What is the number? Answer: 44.
Day 59: Add tens
Model separately, before independent practice: Three tens plus four tens is seven tens: 30 + 40 = 70.
For adults: check the four numbered items against the matching student practice. Accept correct equivalent explanations, drawings and wordings. Reteach using fresh numbers rather than repeating these questions.
Practice 1: 20 + 30 = ___ Answer: 50.
Practice 2: 40 + 20 = ___ Answer: 60.
Practice 3: 50 + 20 = ___ Answer: 70.
Practice 4: 10 + 80 = ___ Answer: 90.
Day 60: Place-value review
Model separately, before independent practice: The number 74 has seven tens and four ones. Ten less is 64.
For adults: check the four numbered items against the matching student practice. Accept correct equivalent explanations, drawings and wordings. Reteach using fresh numbers rather than repeating these questions.
Practice 1: Write 81 as tens and ones. Answer: 8 tens and 1 one.
Practice 2: Which is ten less than 96? Answer: 86.
Practice 3: Compare 47 and 74 using a symbol. Answer: 47 < 74.
Practice 4: Three tens and eight ones make what number? Answer: 38.
Two-week checkpoint
Use four unseen problems, one oral explanation, and one real-world application. Record addition/subtraction accuracy, place-value reasoning, and representation separately. These materials are locally developed and require standards review before claims of comprehensive alignment.