paki sagot

on your own:

A. solve each item by rapid calculation.
1. 1+2+3+...+198+199+200=________
2. 1+2+3+...+80+81+82=________
3. 1+2+5+...+385+387+389=______
4. 1+3+5+...+991+993+995=________
5. 2+4+6+...+236+238+240=______
6. 2+4+6+...+896+898+900=______

D. Compute each using shortcut method.
1. 11+12+13+...+78+78+80
2. 53+54+55+...+99+100
3. 39+41+43+...+117+119+121
4. 1 963+1 965+...+2 003+2 005
5. 16+18+20+...+32+34
6. 44+46+48+...+500+502


yan lang po salamat
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