Adding and Subtracting through the 10s and 100s

 Adding and Subtracting 100s, 10s & 1s

-We are learning to solve subtraction problems by subtracting 100s, 10s and 1s.

-We are learning to solve addition problems by adding 100s, 10s and 1s

Question	Working	Answer
475 +158=	E.g.  400 + 100 = 500 70 + 50 = 120 5 + 8 = 13 500 + 120 = 13 = 633	633
199+188=	100 + 100 = 200 90 + 80 = 170 9 + 8 = 17 200 + 170 + 17 = 387	387
634+197=	600 + 100 = 700 30 + 90 = 120 4 + 7 = 11 700 + 120 + 11 = 831	831
188+189=	100 + 100 = 200 80 + 80 = 160 8 + 9 = 17 200 + 160 + 17 = 377	377
299+156=	200 + 100 = 300  90 + 50 = 140  9 + 6 = 15 300 + 140 + 15 = 455	455

Question	Working	Answer
482-394=	482 - 300 = 182  182 - 90 = 92 92 - 4 = 88	88
531-198=	531 - 100 = 431 431 - 90 = 341 341 - 8 = 333	333
535-379=	535 - 300 = 235 235 - 70 = 165 165 - 9 = 156	156
933-399=	933 - 300 = 633 633 - 90 = 543 543 - 9 = 534	534
221-177=	221 - 100 = 121 121 - 70 = 51 51 - 7 = 44	44

Word problems

Problem	Working and answer
Miss Tuiā had $833 and she spent $245 at K-mart. How much money does Miss Tuiā have left?	833 - 245 = 588 833 - 200 = 633 633 - 40 = 593 593 - 5 = 588
Pt England bakery baked 174 cookies in the morning and another batch of 289 cookies in the afternoon.  How many cookies did they bake altogether?	298 + 174 = ? 298 + 100 = 398 398 +70 = 468  468 + 4 = 472