Add/Sub Yr 6 WALT solve addition problems by changing one of the numbers into a tidy number

143 + 78 = 221 -2      +2 141 + 80 = 221	456 + 101 = 557 +1       -1 457 + 100 = 557	235 + 87 = 222 -3       +3 232 + 90 = 222
135 + 49 = 184 -1       +1 134 + 50 = 184	335 + 48 = 383 -2       +2 333 + 50 = 383	158 + 37 = 195 +2      -2 160 + 35 + 195
236 + 199 = 435 -1        +1 235 + 200 = 435	248 + 54 = 302 +2       -2 250 + 52 = 302	456 + 299 = 755 -1        +1 455 + 300 = 755
88 + 124 = 212 +2     -2 90 + 122 = 212	315 + 78 = 393 -2      +2 313 + 80 = 393	198 + 53 = 251 +2      -2 200 + 51 = 251
119 + 73 = 192 +1     -1 120 + 72 = 192	64 + 128 = 188 -2     +2 62 + 126 = 188	231 + 88 = 318 -2      +2 228 + 90 = 318