WALT add and subtract numbers involving decimals
Make sure you show how you worked it out! Using brackets ( ) to expand numbers out
- 3.4 + 6.7 = 10.1
(3 + 6 = 9)+ (0.4 +0.7 = 1.1)
- 12.8 + 9 = 21.8
(12 + 9 = 21) + ( 0.8+0.0 = 0.8 )
- 23.2 + 38.5 = 61.7
(23 + 38 = 61) + (0.2 + 0.5 =0.7)
- 10 + 0.7 = 10.7
(10 + 0 = 10 ) +( 0.7 + 0.0 = 0.7)
- 47.5 + 61.8 =109.3
(47 + 61 = 108) + (0.5 +0.8 = 1.3)
- 18 + 4.8 =22.8
(18 + 4 = 22) (0.8 +0.0 = 0.8)
- 33.5 + 7.6 = 41.1
(33 + 7 =40) (0.5 + 0.6 = 1.1 )
- 68 + 12.3 =80.3
(68 + 12 = 80) (0.0 +0.3 = 0.3)
- 19.5 + 19.5 =39.0
(19 + 19 = 38) (0.5 +0.5 =1.0)
- 172 + 17.2 = 190.2
(172 + 17 =190) (0.0 + 0.2 = 0.2)
- 23.3 + 4.4 = 27.7
(23 + 4 = 27) + (0.3 + 0.4 = 0.7)
- 101 + 110.1 = 211.1
(101 + 110 =211) + ( 0.0 +0.1 =0.1)
SUBTRACTION!!!!!
- 8.3 - 6.6 = 2.3
(8 - 6 = 2) + (0.6 -0.3 = 0.3 )
- 13.7 - 9 = 4.7
(13 - 9 = 4) + 0.7 +0.0 )
- 29.9 - 10.5 = 19.4
(29 - 10 = 19) + (0.9 - 0.5 = 0.4 )
- 10 - 4.7 = 6.7(10 - 4 = 6) + ( 0.0 - 0.7 = 0.7)
- 40.4 - 1.9 = 39.5
(40 - 1 = 39) +( 0.4 - 0.9 = 0.5 )- 11.6 - 3.8 = 9.2
(11 - 3 = 9 ) + ( 0.6 - 0.8 = 0.2)- 37.2 - 3.1 = 34.1
(37 - 3 = 34) + (0.2 - 0.1= 0.1)- 68.4 - 22.3 =46.1
(68 - 22 =46) + (0.4 - 0.3 = 0.1)- 30 - 17.5 = 13.5
(30 -17 = 13) + (0.0 - 0.5 = 0.5)- 262 - 26.2 = 236.2
(262 - 26 = 236) + (0.0 - 0.2 = 0.2)- 503.3 - 54.4 =457.1
(503 - 54 =457) + ( 0.3 - 0.4 = 0.1)- 903 - 130.8 = 773.8
(903 - 130 = 773) + (0.0 - 0.8 = 0.8)