Grade 1 Mathematics Weeks 21–22: Teacher Guide and Answer Key
Suggested daily lesson: 5 minutes review, 10 minutes teacher modeling, 10 minutes guided practice, 10 minutes independent work, and 5 minutes feedback. Adjust to learner needs.
Week 21: Shapes and fractions of shapes
Day 101: Sides and corners
Teacher model: How many corners does a rectangle have? Answer: 4. Draw and count the corners.
Guided answer: 4.
Practice 1: How many corners does a rectangle have? Answer: 4.
Practice 2: How many corners does a rectangle have? Answer: 4.
Practice 3: How many corners does a rectangle have? Answer: 4.
Practice 4: How many corners does a rectangle have? Answer: 4.
Ask the learner to explain their strategy and check the result with a second representation when possible.
Day 102: Triangles
Teacher model: How many sides does a triangle have? Answer: 3. Draw and count the sides.
Guided answer: 3.
Practice 1: How many sides does a triangle have? Answer: 3.
Practice 2: How many sides does a triangle have? Answer: 3.
Practice 3: How many sides does a triangle have? Answer: 3.
Practice 4: How many sides does a triangle have? Answer: 3.
Ask the learner to explain their strategy and check the result with a second representation when possible.
Day 103: Partition into halves
Teacher model: If a rectangle is split into 2 equal parts, how many halves are there? Answer: 2. Equal parts must have the same area.
Guided answer: 2.
Practice 1: If a rectangle is split into 2 equal parts, how many halves are there? Answer: 2.
Practice 2: If a rectangle is split into 2 equal parts, how many halves are there? Answer: 2.
Practice 3: If a rectangle is split into 2 equal parts, how many halves are there? Answer: 2.
Practice 4: If a rectangle is split into 2 equal parts, how many halves are there? Answer: 2.
Ask the learner to explain their strategy and check the result with a second representation when possible.
Day 104: Partition into fourths
Teacher model: If a square is split into 4 equal parts, how many fourths are there? Answer: 4. Equal parts must have the same area.
Guided answer: 4.
Practice 1: If a square is split into 4 equal parts, how many fourths are there? Answer: 4.
Practice 2: If a square is split into 4 equal parts, how many fourths are there? Answer: 4.
Practice 3: If a square is split into 4 equal parts, how many fourths are there? Answer: 4.
Practice 4: If a square is split into 4 equal parts, how many fourths are there? Answer: 4.
Ask the learner to explain their strategy and check the result with a second representation when possible.
Day 105: Geometry checkpoint
Teacher model: How many corners does a rectangle have? Answer: 4. Draw and count the corners.
Guided answer: 4.
Practice 1: How many corners does a rectangle have? Answer: 4.
Practice 2: How many corners does a rectangle have? Answer: 4.
Practice 3: How many corners does a rectangle have? Answer: 4.
Practice 4: How many corners does a rectangle have? Answer: 4.
Ask the learner to explain their strategy and check the result with a second representation when possible.
Week 22: Cumulative problem solving
Day 106: Two-step context
Teacher model: 8 + 6 = ___ Answer: 14. Use counters or make a ten.
Guided answer: 16.
Practice 1: 10 + 6 = ___ Answer: 16.
Practice 2: 8 + 7 = ___ Answer: 15.
Practice 3: 9 + 6 = ___ Answer: 15.
Practice 4: 10 + 7 = ___ Answer: 17.
Ask the learner to explain their strategy and check the result with a second representation when possible.
Day 107: Choose operation
Teacher model: 16 – 7 = ___ Answer: 9. Show a subtraction drawing.
Guided answer: 9.
Practice 1: 18 – 7 = ___ Answer: 11.
Practice 2: 16 – 8 = ___ Answer: 8.
Practice 3: 17 – 7 = ___ Answer: 10.
Practice 4: 18 – 8 = ___ Answer: 10.
Ask the learner to explain their strategy and check the result with a second representation when possible.
Day 108: Explain place value
Teacher model: Write 86 as tens and ones. Answer: 8 tens and 6 ones. Draw tens rods and ones.
Guided answer: 8 tens and 7 ones.
Practice 1: Write 88 as tens and ones. Answer: 8 tens and 8 ones.
Practice 2: Write 86 as tens and ones. Answer: 8 tens and 6 ones.
Practice 3: Write 87 as tens and ones. Answer: 8 tens and 7 ones.
Practice 4: Write 88 as tens and ones. Answer: 8 tens and 8 ones.
Ask the learner to explain their strategy and check the result with a second representation when possible.
Day 109: Measure and compare
Teacher model: One strip measures 14 equal-size cubes and another 8. How many cubes longer is the first? Answer: 6. Subtract the lengths in matching units.
Guided answer: 6.
Practice 1: One strip measures 16 equal-size cubes and another 8. How many cubes longer is the first? Answer: 8.
Practice 2: One strip measures 14 equal-size cubes and another 9. How many cubes longer is the first? Answer: 5.
Practice 3: One strip measures 15 equal-size cubes and another 8. How many cubes longer is the first? Answer: 7.
Practice 4: One strip measures 16 equal-size cubes and another 9. How many cubes longer is the first? Answer: 7.
Ask the learner to explain their strategy and check the result with a second representation when possible.
Day 110: Independent checkpoint
Teacher model: 18 – 9 = ___ Answer: 9. Show a subtraction drawing.
Guided answer: 9.
Practice 1: 20 – 9 = ___ Answer: 11.
Practice 2: 18 – 10 = ___ Answer: 8.
Practice 3: 19 – 9 = ___ Answer: 10.
Practice 4: 20 – 10 = ___ Answer: 10.
Ask the learner to explain their strategy and check the result with a second representation when possible.
Assessment and privacy
At the end of each week, provide unfamiliar problems of the same types, record independent accuracy and reasoning separately, and reteach misconceptions. Do not publish student scores or claim comprehensive standards alignment from these materials alone.