TERM 2


Add 5-digit whole Unit 2.2 numbers


52 376 = 50 000 + 2 000 + 300 + 70 + 6 (+) 39 687 = 30 000 + 9 000 + 600 + 80 + 7 Answer = 80 000 + 11 000 + 900 + 150 + 13 = 90 000 + = 92 063


1 000 + 1 000 +


(+) shows: add (arrange)


(add columns) 60 + 3 (build up the answer)


Method 3: Adding on To add on, break down the number to be added: 52 376 + 39 687


= 52 376 + 30 000 + 9 000 + 600 + 80 + 7 = 82 376 + 9 000 + 600 + 80 + 7 = 91 376 + 600 + 80 + 7 = 91 976 + 80 + 7 = 92 056 + 7 = 92 063 or


(break up 39 687) (add 30 000) (add 9 000) (add 600) (add 80) (add 7)


52 376 + 30 000 → 82 376 + 9 000 → 91 376 + 600 → 91 976 + 80 → 92 056 + 7 → 92 063 Check by using subtraction:


(92 063 − 30 000) − 9 000 − 600 − 80 − 7 = (62 063 − 9 000) − 600 − 80 − 7 = (53 063 − 600) − 80 − 7 = (52 463 − 80) − 7 = 52 383 − 7 = 52 376; True


Activity 2


1 Calculate by adding in rows. a 16 021 + 2 614


b 28 487 + 14 486


d 42 866 + 37 385 e 55 646 + 38 590 g 75 992 + 22 646 h 85 902 + 14 097


2 Calculate by adding in columns. a 12 794 + 7 170


3 Calculate by adding on. a 17 984 + 7 907


b 23 412 + 18 746


d 43 032 + 24 039 e 56 902 + 42 760 g 74 916 + 17 425 h 86 465 + 13 358


b 21 923 + 11 344


d 41 647 + 36 437 e 51 469 + 28 672 g 73 004 + 24 972 h 84 146 + 15 784


c 31 242 + 24 407 f 65 250 + 27 005 i 90 821 + 14 179


c 38 944 + 29 019 f 62 811 + 19 650 i 94 134 + 10 866


c 37 871 + 28 696 f 68 407 + 15 082 i 92 563 + 12 437


Unit 2.2: Add 5-digit whole numbers 97


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