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LESSON 4.2 Name Addition Properties Vocabulary Complete the sentences. 1. 2. Associative The Property of Addition states that the way addends are grouped does not change the sum. Commutative The Property of Addition states that the numbers can be added in any order and the sum will be the same. Find the missing number, and tell which addition property you used. 3. 5 (2 1) (5 6. 45 )1 9 9 4. 72 18 7. 15 72 15 5. 8. 0 24 (4 ) (5 4) Change the order or group the addends so that you can add them mentally. Possible answers are given. Find the sum. Tell which property you used. Check students’ properties. 9. 22 14 8 10. (12 17) 3 11. 20 16 80 2 106 13. 25 (15 28) 14. (145 290) 110 17. 340,112 © Harcourt 12. 4 Mixed Review What is the value of the digit 4 in each number? 15. 84,250,000 4,000,000 16. 1,024 4 40,000 Practice PW17 LESSON 4.2 Name Addition Properties Vocabulary Complete the sentences. 1. 2. Associative The Property of Addition states that the way addends are grouped does not change the sum. Commutative The Property of Addition states that the numbers can be added in any order and the sum will be the same. Find the missing number, and tell which addition property you used. 3. 5 (2 1) (5 )1 4. 72 2; Associative 6. 45 18 72 5. 18; Commutative 9 9 7. 15 45; Commutative 15 0 24 24; Identity 8. 0; Identity (4 ) (5 4) 5; Commutative Change the order or group the addends so that you can add them mentally. Possible answers are given. Find the sum. Tell which property you used. Check students’ properties. 9. 22 14 8 10. (12 17) 3 11. 20 16 80 (22 8) 14; 44 12. 4 2 106 12 (17 3); 32 13. © Harcourt (4 106) 2; 112 25 (15 28) (20 80) 16; 116 14. (25 15) 28; 68 (145 290) 110 145 (290 110); 545 Mixed Review What is the value of the digit 4 in each number? 15. 84,250,000 4,000,000 16. 1,024 4 17. 340,112 40,000 Practice PW17