In this set of Four-in-a-Row games, your students will practice mental addition and subtraction of 10. There are 3 game boards: 2 address adding 10 to 2-digit numbers, the third is for addition of tens to hundreds. The first game uses a pair of dice, and spinners are included for the other 2 games. All of the games are suitable for use in small groups or in math centers.
CCCS 1.NBT.5: Given a two-digit number, mentally find 10 more or 10 less than the number, without having to count, explain the reasoning used.
CCCS 2.NBT.8: Mentally add 10 or 100 to a given number 100–900, and mentally subtract 10 or 100 from a given number 100–900.
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