U.6 Complete addition or subtraction sentences
Complete the subtraction sentence:
684 − = 284
Complete the addition sentence:
678 = 208 +
620 = 210 +
951 = 440 +
150 = 204 −
756 = 236 +
540 = 589 −
902 = 421 +
733 = 221 +
750 = 804 −
753 = 231 +
738 = 125 +
913 = 115 +
280 = 345 −
230 = 312 −
430 = 502 −
640 = 705 −
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