Adding & 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
248+139=	200 + 100 = 300 40 + 30 = 70 8 + 9 = 17 300 + 70 + 17 = 387	387
487+209=	400 + 200 = 600 80 + 0 = 80 7 + 9 = 16 600 + 80 + 16 = 696	698
530+276=	500 + 200 = 700  30 + 70 = 100 0 + 6 = 6 700 + 100 + 6 = 806	806
302+508=	300 + 500 = 800  0 +0 = 0 2 + 8 = 10	810

Question	Working	Answer
512-109=	512 - 100 = 412  412 - 0 = 412 412 - 9 = 403	403
643-211=	600 - 200 = 400 40 - 10 = 30  3 - 1 = 2 400 + 30 + 2 = 432	432
798-331=	798 - 300 = 498 498 - 30 = 468 468 - 1 = 467	467
233-99=	233 - 90 = 143 143 - 9 = 134	134
321-177=	321 - 100 = 221 221 - 70 = 151 151 - 7 = 144	144

Word problems

Problem	Working and answer
Mr Huges has to update his internet usage at home.  He is currently on ADS to unlimited broadband ss Tuiā had $833 and she spent $245 at K-mart. How much money does Miss Tuiā have left?	883 - 245 = 638 883 - 200 = 683  683 - 40 = 643 643 - 5 = 638
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?	174 + 289 =  174 + 200 = 374 374 + 80 = 454 454 + 9 = 363