Unit 1: Whole Numbers
Lesson 1: Number Forms
Four Digit Number:
Standard Form
9548 |
Expanded Form
9000 + 500 + 40 + 8 |
Written Form
nine thousand five hundred forty eight |
Lesson 2: Comparing Numbers
Two Rules:
1. More digits means bigger number. EX. 5423 > 582
2. If same number of digits, look at the leftmost digit. EX. 5138 < 6842
1. More digits means bigger number. EX. 5423 > 582
2. If same number of digits, look at the leftmost digit. EX. 5138 < 6842
Lesson 3: Venn and Carroll Diagrams
Venn Diagram Practice |
Carroll Diagram Example |
Lesson 4: Estimating Sums
A-Way
Example - 286 + 423 --- What is the estimate?
1. Round to the nearest hundred.
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2. Align the numbers and Add
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B-Way
1. Add the first digits.
2. Round the other digits.
3. add.
Lesson 5: Calculating Sums
1. Align the numbers.
2. Start adding from the one place
3. Carry over if you need to.
Lesson 6: Calculating Differences (no zero)
1. Align the minuend and subtrahend. |
2. check and borrow.
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3. Subtract easily.
Lesson 7: Calculating Differences (with zero)
1. Align the minuend and subtrahend.
2. Check and borrow. Double borrow if neighbour is 0.
3. Subtract comfortably.
Lesson 8: Estimating Differences
1. round the subtrahend to the closest hundred.
2. Subtract comfortably.
Vocabulary