Maths - 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	696
530+276=	500 + 200 = 800 30 + 70 = 100 0 + 6 = 6 800 + 100 + 6 = 906	906
302+508=	300 + 500 = 800  0 + 0 =  0  2 + 8 = 10  800 + 0 + 10 = 810	810

Question	Working	Answer
512-109=	500 - 10 = 490 10 - 0 = 10 2 - 9 = 0 490 + 10 + 0 = 500	500
643-211=	600 - 200 = 400 40 - 10 = 30 3 - 1 = 2 400 + 30 + 2 = 432	432
798-331=	700 - 300 = 400 90 - 30 = 60 8 - 1 = 7 400 + 60 + 7 = 467	467
233-99=	200 - 0 = 200 30 - 90 = 0 3 - 9 = 0 200 + 0 + 0 = 200	200
321-177=	300 - 100 = 200 20 - 70 = 0  1 - 7  = 0  200 + 0 + 0 = 200	200

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?	$833 - $245 = $610 $800 - $200 = $600 $40 - $30 = $10 $3 - $5 =$0 $600 + $10 + $0 = $610
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 = 463 100 + 200 = 300  70 + 80 = 150  4 + 9 = 13 300 + 150 + 13 = 463

This is my Maths and I have done some addition and some subtraction I hope you enjoy and also learn something.