Calculating
2 Use a mental strategy to find the difference between 645 and 213
Letisha uses a strategy that uses addition. 213 +
+
+
+
613 Next, she adds tens to reach 643. +
+
+
643 Finally, she adds ones to reach 645.
+
+
645
Letisha adds up the hundreds, tens and ones to find the difference.
+
+
= 432
645 − 213 = 432
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