Infant Jesus Academy Math 3 2nd Quarterly Exam Reviewer PDF

Infant Jesus Academy 2 Quarterly nd Exam Reviewer MATHEMATICS 3 Lord Jesus, I pray that you multiply your grace on me. Subtract and take away all of my sins. Add wisdom and understanding, and I will divide my blessings and share them with others. Amen. Second Quarter Topics:...

Infant Jesus Academy 2 Quarterly nd Exam Reviewer MATHEMATICS 3 Lord Jesus, I pray that you multiply your grace on me. Subtract and take away all of my sins. Add wisdom and understanding, and I will divide my blessings and share them with others. Amen. Second Quarter Topics: o Properties of Addition o Addition (Actual and Estimated Sum) o Mental Addition o Addition Word Problems o Subtraction (Actual and Estimated Difference) o Mental Subtraction o Subtraction Word Problems o Two-step Word Problems involving Addition and Subtraction ADDITION SENTENCE addends equal sign plus sign sum Properties of Addition Commutative Property of Addition This property states that the order of the addends does not affect the sum. Examples: 7+8=8+7 9+3=3+9 15 = ___ ___ 15 12 = ___ ___ 12  Associative Property of Addition This property states that the groupings of the addends do not affect the sum. Example: (7 + 8) + 4 = 7 + (8 + 4) 15 + ___ ___ 4 = ___ 12 7 + ___ 19 19 = ___ ___  Identity Property of Addition This property states that any number added to zero is equal to the number itself. Examples: 45 + 0 = 45 0 + 37 = 37 255 + 0 = 255 Identify the property of addition shown in each equation. (6 + 2) + 10 = 6 + (2 + 10) associative commutative identity Identify the property of addition shown in each equation. 13 + 12 = 12 + 13 associative commutative identity Identify the property of addition shown in each equation. 858 + 0 = 858 associative commutative identity Fill in the blanks with the missing number. 10 + 52 52 + 10 = ___ 5 2 + (3 + 5) = (2 + 3) + ___ 125 + 0 = 125 ___ Addition within 10 000  SOLVE FOR THE ACTUAL AND ESTIMATED SUM Estimate by rounding each number to the nearest ten before adding. 1 1 1 1 837 → 1 840 The estimated sum is 6 190, which is + 4 349 → 4 350 4 greater than the 6 18 6 6 190 actual sum of 6 186. Actual sum: Estimated sum: SOLVE FOR THE ACTUAL AND ESTIMATED SUM Estimate by rounding each number to the nearest hundred before adding. 1 11 1 4 859 → 4 900 The estimated sum is 9 500, which is + 4 585 → 4 600 56 greater than the 9 44 4 9 500 actual sum of 9 444. Actual sum: Estimated sum: Mentally add the following numbers. You may use any strategy you know. 106 59 + 47 = ______ 90 + 80 = ______ 170 60 28 + 32 = ______ 500 + 900 = ______ 1 400 1 500 700 + 800 = ______  Addition Word Problems Steps Step 1 Read and analyze the problem. Step 2 Draw and label the bar model. Step 3 Write the addition sentence and show your solution. Step 4 Write your answer in a complete sentence.  An Animal Shelter received donations to help take care of animals. On Monday, they received 2 558 pesos from a local store. On Tuesday, a group of students collected 1 684 pesos from their community. How much money did they receive in all? Bar model: Solution: 1 11 2 558 1 684 2 558 ? Number sentence: 2 558 + 1 684 = ? + 1 684 Answer in a complete sentence: 4 24 2 The Animal Shelter received 4 242 pesos in all.  minus equal minuend subtrahend difference SOLVE FOR THE ACTUAL AND ESTIMATED DIFFERENCE Estimate by rounding each number to the nearest TEN before subtracting. 4 12 5 14 4 12 5 264 ≈ 5 260 The estimated difference is - 1 847 ≈ 1 850 3 410, which is 7 lesser than the 3 41 7 3 410 actual difference of 3 417. Actual difference Estimated difference SOLVE FOR THE ACTUAL AND ESTIMATED DIFFERENCE Estimate by rounding each number to the nearest HUNDRED before subtracting. 7 11 1 14 7 11 8 124 ≈ 8 100 The estimated difference is - 5 515 ≈ 5 500 2 600, which is 9 lesser than the 2 60 9 2 600 actual difference of 2 609. Actual difference Estimated difference Mentally subtract the following numbers. You may use any strategy you know. 52 97 - 45 = ______ 100 - 37 = ______ 63 57 89 - 32 = ______ 81 - 46 = ______ 35 49 500 - 451 = ______  Subtraction Word Problems Steps Step 1 Read and analyze the problem. Step 2 Draw and label the bar model. Step 3 Write the subtraction sentence and show your solution. Step 4 Write your answer in a complete sentence.  The local park has 6 200 trees in total. A storm damaged 1 875 trees. How many healthy trees are left in the park? Bar model: Solution: 5 11 9 10 6200 6 200 1 875 ? - 1 875 Number sentence: 6 200 – 1 875 = ? Answer in a complete sentence: 4 3 25 There are 4 325 healthy trees left in the park. Two-step Word Problems involving Addition and Subtraction Sarah has 68 stickers in her collection. She buys 34 more stickers at the store, then gives 15 stickers to her friend. How many stickers does Sarah have now? 68 + 34 - 15 = ? Add 68 and 34 102 - 15 = 87 Subtract 15 from 102 Sarah has 87 stickers now. Two-step Word Problems involving Addition and Subtraction A school library has 127 books on the shelves. They receive 43 new books as a donation but decide to remove 19 old books. How many books are in the library now? 127 + 43 - 19 = ? Add 124 and 43 170 - 19 = 151 Subtract 19 from 170 There are 151 books in the library now. Good job! Keep up the good work! Good luck with your exam! I know you’ll do well! ❤