Elementary Mathematics 1


Odd and Even Numbers (Numbers up to 100)

• Odd Numbers are numbers that cannot be paired or group by two's.
• examples:  23,               17 ones,        forty-nine     
• Even Numbers are numbers that can be paired or group by two's.
• examples: 5 tens and 6 ones,      thirty

Identify if the given numbers are odd or even. 

___________1. seventy

___________2. ninety-three

___________3. 8 tens and 7 ones

___________4. 10 tens

___________5. 92 ones

___________6. eleven

___________7. forty- two

___________8. 5 ones and 6 tens

Addition Facts

  

       8  +  7  =  15

      8 and 7 are addends and 15 is the sum.

Addends are numbers to be added and the sum is the total/answer.

Addition of 2 one-digit numbers

• By counting on
• By making tens

Addition of 3 one-digit numbers

• By making tens

Addition on 2-digit numbers without and with Regrouping (Sums up to 100)

Prepared by: Mrs. Mary Ann J. Acedo