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Tell and write time in hours and half-hours using analog and digital clocks.
1.NBT.A.1 Understand that 10 can be thought of as a bundle of 10 ones – called a “ten”.
1.NBT.A.2 Understand two-digit numbers are composed of ten(s) and one(s).
Use addition and subtraction within 20 to solve problems.
Use properties as strategies to add and subtract.
1.RA.B.6 Demonstrate that subtraction can be solved as an unknown-addend problem. 1.RA.C.7 Add and subtract within 20. 1.RA.C.8 Demonstrate fluency with addition and subtraction within 10.
1.RA.A.3 Develop the meaning of the equal sign and determine if equations involving addition and subtraction are true or false.
1.RA.A.4 Determine the unknown whole number in an addition or subtraction equation relating three whole numbers.
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