Adding Tens
Add using mental math. 40 + 42 =
82
Add the hundreds. Use mental math. 170 + 400 =
570
Add using mental math. 550 + 130 =
680
Add the hundreds. Use mental math. 380 + 500 =
880
Add using mental math. 420 + 230 =
650
Add using mental math. 135 + 40 =
175
Add the hundreds. Use mental math. 490 + 300
790
Add using mental math. 120 + 250 =
370
Find the PATTERN and the NEXT 2 NUMBERS: 110, 120, 130
+10 40. 50