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Consider the unit digit in both numbers on LHS so 5 + ? = 6 => 5+1=6 445 + 321 = 766.
► Consider the unit digit in both numbers on LHS so 9 + 6 = 15
Hence 5 comes in the unit digit and 1 is carried over.
► Consider the tens digit in both numbers on LHS.
Now since 0 is the tens digit in 805 the sun of tens digits on numbers on LHS should add up to 10 (1 gets carried over).
So 1 + 4 +? = 10 = >? = 5
► Consider the hundreds digit in both numbers on LHS. 1+3+4=8 349+456 =805.
456 + 31 = 487
So 360 + 31 = 391, So ? = 391
7000 + 1000 = 8000
Similary 4000 + 1000 = 5000
Find the missing number. 450, 460, ___, 480, 490, ___
Add 10 to each term to get the next term.
460 + 10 = 470, 470 + 10 = 480, 480 + 10 = 490, 490 + 10 = 500
Find the missing number. 344, 351, 358, ___, ___.
Add 7 to each term to get the next term.
► 344 + 7 = 351
► 351+7=358
► 358 + 7 =365
► 365+ 7 = 372
Which number makes the equation true? ? +1323 = 1223 + 1223
1123 + 1323 = 2446 = 1223 + 1223
Which number makes the equation true? 419 +? = 581 + 116
419+278=581+116=697
Which number makes the equation true? 1508 + 1125 = 2407 +?
1508 + 1125 = 2407 + 226 = 2633
Which number makes the equation true? 43 + ? = 26 + 68
43 + 51 = 26 + 68 = 94
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