5Th Class Maths Additon & Subtraction.

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Presentation transcript:

5Th Class Maths Additon & Subtraction

B. WHOLE NUMBERS 1. Addition Number Line - Shows numerals in order of value Number Line Adding on the Number Line (2 + 3 = 5) Adding on the Number Line Adding with pictures Adding with pictures

1. Addition (con’t) Adding in columns - Uses no equal sign 5 + 5 10 897 + 368 1265 Answer is called “sum”. Simple Complex Table of Digits

ADDITION PRACTICE EXERCISES + 222 318 + 421 c. 611 + 116 d. 1021 + 1210 444 739 727 2231 2. a. 813 + 267 924 + 429 c. 618 + 861 411 + 946 1080 1353 1479 1357 3. a. 813 222 + 318 1021 611 + 421 c. 611 96 + 861 d. 1021 1621 + 6211 1353 2053 1568 8853 Let's check our answers.

2. Subtraction Number Line - Can show subtraction. Number Line Number Line Subtraction with pictures Position larger numbers above smaller numbers. If subtracting larger digits from smaller digits, borrow from next column. 4 5 3 8 - 3 9 7 1 1 4 1

SUBTRACTION PRACTICE EXERCISES - 3 8 - 4 c. 5 - 2 d. 9 - 5 e. 7 - 3 3 4 3 4 4 2. a. 11 - 6 b. 12 - 4 c. 28 - 9 d. 33 - 7 e. 41 - 8 5 8 19 26 33 3. a. 27 - 19 b. 23 - 14 c. 86 - 57 d. 99 - 33 e. 72 - 65 8 9 29 66 7 Let's check our answers.

SUBTRACTION PRACTICE EXERCISES (con’t) - 241 399 - 299 c. 847 - 659 d. 732 - 687 146 100 188 45 5. a. 3472 - 495 b. 312 - 186 c. 419 - 210 d. 3268 - 3168 2977 126 209 100 6. a. 47 - 38 b. 63 - 8 c. 47 - 32 d. 59 - 48 9 55 15 11 7. a. 372 - 192 b. 385 - 246 c. 219 - 191 d. 368 - 29 180 139 28 339 Let's check our answers.

3. Checking Addition and Subtraction 2 + 8 10 - 8 5 + 3 8 - 3 73 + 48 121 - 48 Result should produce other added number. Check Addition - Subtract one of added numbers from sum. Check Addition 927 318 426 183 To Add To Check Check Three or more #s Check Three or more #s - Add from bottom to top. 5 - 4 1 + 4 62 - 37 25 + 37 103 - 87 16 + 87 Check Subtraction - Add subtracted number back. Check Subtraction

Check these answers using the method discussed. CHECKING ADDITION & SUBTRACTION PRACTICE EXERCISES 1. a. 6 + 8 b. 9 + 5 c. 18 + 18 d. 109 + 236 13 14 26 335 2. a. 87 - 87 b. 291 - 192 c. 367 - 212 d. 28 - 5 1 99 55 24 3. a. 34 + 12 b. 87 13 81 + 14 c. 87 13 81 + 14 d. 21 - 83 46 104 195 746 4. a. 28 - 16 b. 361 - 361 c. 2793142 - 1361101 22 1432141 Check these answers using the method discussed.

CHECKING ADDITION & SUBTRACTION PRACTICE EXERCISES + 8 13 - 8 5 b. 9 + 5 14 - 5 9 c. 18 + 18 26 - 18 8 d. 109 + 236 335 - 236 99 2. a. 87 - 87 1 + 87 88 b. 291 - 192 99 + 192 291 c. 367 - 212 55 + 212 267 d. 28 - 5 24 + 5 29 3. a. 34 + 12 46 - 12 34 b. 195 87 13 81 + 14 195 c. 949 103 212 439 + 195 746 d. 21 + 83 104 - 83 21 4. a. 28 - 16 22 + 16 38 b. 361 - 361 + 361 361 c. 2793142 - 1361101 1432141 + 1361101 2793242 # = Right # = Wrong