• ### B.1. Addition and Subtraction (up to 10)

3. #### B.1.1. Addition (up to sum 10)

1. B.1.1.O. Overview
2. B.1.1.1. Addition Sentences (up to sum 10)
3. B.1.1.2. Adding by counting on (up to sum 10)
4. B.1.1.3. Writing addition sentences (up to sum 10)
5. B.1.1.4. Word problems-adding two numbers (up to sum 10)
4. #### B.1.4. Subtraction (numbers up to 10)

1. B.1.4.O. Overview
2. B.1.4.1. Subtraction by counting backward with pictures
3. B.1.4.2. Subtracting by cross out with pictures - numbers up to 10
4. B.1.4.3. Select the subtracting sentence by crossing out- numbers up to 10
5. B.1.4.4. Subtracting by grouping (number up to 10)
6. B.1.4.5. Word problems-Subtraction with pictures –cross out - 1 digit
7. B.1.4.6. Subtraction word problems - one-digit numbers
8. B.1.4.7. Subtraction word problems: 2-steps –one digit number
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• ### . Addition and Subtraction (up to 20)

3. #### B.1.2. Addition (up to 20)

1. B.1.2.O. Overview
2. B.1.2.1. Addition pictures (up to sum 20)
3. B.1.2.2. Adding using Tens and Ones
4. B.1.2.3. Word problems: Addition with pictures (up to sum 20)
5. B.1.2.4. Word problems (up to sum 20)
6. B.1.2.5. Adding multiple one-digit numbers with pictures
7. B.1.2.6. Word problems - adding multiple one-digit numbers
4. #### B.1.5. Subtraction (numbers up to 20)

1. B.1.5.O. Overview
2. B.1.5.1. Subtraction with pictures –by counting back (numbers up to 20)
3. B.1.5.2. Subtracting by cross out with pictures - numbers up to 20
4. B.1.5.3. Word problems-Subtraction-with pictures-cross out-number up to 20
5. B.1.5.4. Subtracting using Tens and Ones
6. B.1.5.5. Subtracting with group out
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• ### . Addition and Subtraction (up to 20): Knowledge-Based Questions

3. #### B.1.6. Knowledge-Based Questions II

1. B.1.6.O. Overview
2. B.1.6.1. Understanding “less/more than”
3. B.1.6.2. Select the incorrect subtraction sentence – numbers up to 20
4. B.1.6.3. Find the subtraction sentence by pattern – numbers up to 20
5. B.1.6.4. Complete the subtraction sentence – numbers up to 20
6. B.1.6.5. Select the related subtraction facts
7. B.1.6.7. Subtraction word problems - numbers up to 20
8. B.1.6.8. Addition and subtraction word problems- number up to 20
9. B.1.6.9. Addition and subtraction three and more numbers
4. #### B.1.3. Knowledge-Based Questions I

1. B.1.3.O. Overview
2. B.1.3.1. Understanding “more than”
3. B.1.3.2. Select the correct addition sentence
4. B.1.3.3. Select the incorrect addition sentence
5. B.1.3.4. Select the related addition fact
6. B.1.3.5. Complete the addition sentence (up to sum 20)
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• ### B.2. Addition and Subtraction (up to 100)

3. #### B.2.1. Addition (sum up to 100)

1. B.2.1.O. Overview
2. B.2.1.1. Adding two-digit numbers without regrouping
3. B.2.1.2. Adding two-digit numbers with regrouping
4. B.2.1.3. Adding three 2-digit numbers
5. B.2.1.6. Select the correct addition sentence (up to sum 100)
6. B.2.1.7. Select the incorrect addition sentence (sum up to 100)
7. B.2.1.8. Complete the addition sentence (sum up to 100)
4. #### B.2.2. Subtraction (numbers up to 100)

1. B.2.2.O. Overview
2. B.2.2.1. Subtracting 2-digit numbers without regrouping
3. B.2.2.2. Subtracting 2-digit numbers with regrouping
4. B.2.2.5. Select the correct subtraction sentence (numbers to 100)
5. B.2.2.6. Select the incorrect subtraction sentence (numbers to 100)
6. B.2.2.7. Subtraction: Complete the subtraction sentence (numbers to 100)
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• ### . Addition and Subtraction (up to 100): Mixed Operations and Word Problems

3. #### B.2.3. Word Problems: Addition (up to sum 100)

1. B.2.3.O. Overview
2. B.2.3.1. One-step word problems (up to sum 100)
3. B.2.3.2. Two-step word problems (up to sum 100)
4. #### B.2.4. Word Problems: Subtraction (numbers to 100)

1. B.2.4.O. Overview
2. B.2.4.1. One-step word problems (numbers to 100)
3. B.2.4.2. Two-step word problems (numbers to 100)
5. #### B.2.5. Mixed Operations (numbers to 100)

1. B.2.5.O. Overview
2. B.2.5.1. Fill in the missing sign ( + or - ) (numbers to 100)
3. B.2.5.2. Complete the subtraction sentence (numbers to 100)
4. B.2.5.3. Fact family (numbers to 100)
5. B.2.5.4. Inequalities with addition and subtraction (numbers to 100)
6. B.2.5.5. Addition and subtraction terms (numbers to 100)
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• ### B.3. Addition and Subtraction to 1000: Basics

2. #### B.3.Q.

1. B.3.1.O. Overview
3. B.3.1.2. Addition: Select the correct sentence
4. B.3.1.3. Addition: Select the incorrect sentence (sum up to 1000)
4. #### B.3.2. Subtraction

1. B.3.2.O. Overview
2. B.3.2.1. Subtraction: 3 digit – 2 digit (numbers to 1000)
3. B.3.2.2. Subtraction: 3 digit – 3 digit (numbers up to 1000)
4. B.3.2.5. Subtraction: Select the correct sentence (numbers to 1000)
5. B.3.2.6. Subtraction: Select the incorrect sentence (numbers to 1000)
6. B.3.2.7. Subtraction: Complete the subtraction sentence (numbers to 1000)
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• ### . Addition and Subtraction to 1000: Word Problems

3. #### B.3.5. Mixed Operations: Word Problems (numbers to 100)

1. B.3.5.O. Overview
2. B.3.5.1. Mixed Operations: Addition-Subtraction I
3. B.3.5.2. Mixed Operations: Addition-Subtraction II
4. B.3.5.3. Mixed Operations: Subtraction-Addition I
5. B.3.5.4. Mixed Operations: Subtraction-Addition II
4. #### B.3.6. Word Problems: Adding/Subtracting 3 Numbers

1. B.3.6.O. Overview
2. B.3.6.1. Word Problems: Adding 3 Numbers
3. B.3.6.2. Word Problems: Subtracting 3 Numbers (same)
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• ### . Addition and Subtraction to 1000: Enrichment

3. #### B.3.3. Mixed Operations (numbers to 1000)

1. B.3.3.O. Overview
2. B.3.3.1. Mixed Operations: Select the correct sentence (numbers to 1000)
3. B.3.3.2. Mixed Operations: Select the incorrect sentence (numbers to 1000)
4. B.3.3.3. Fill in the missing sign (+ or -) (numbers to 1000)
5. B.3.3.4. Fact family (numbers to 1000)
6. B.3.3.5. Addition and subtraction terms (numbers to 1000)
7. B.3.3.6. Balance the equations (numbers to 1000)
8. B.3.3.7. Challenge flow chart (numbers to 1000)
4. #### B.3.4. Comparing Word Problems

1. B.3.4.O. Overview
2. B.3.4.1. Guess the correct number
3. B.3.4.2. More and less
4. B.3.4.3. Comparing: One-step word problems
5. B.3.4.4. Comparing: Two-part questions
6. B.3.4.5. Comparing: Two-step word problems
7. B.3.4.6. Comparing: Multi-step word
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