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13 Addition and Subtraction to 40
Chapter
Dear Family,
Vocabulary to Practice
In this chapter, your child will learn to add and subtract numbers XJUIJOJOWFSUJDBMGPSN Some of the skills your child will practice are: % BEEJOHBOETVCUSBDUJOHXJUIBOEXJUIPVUSFHSPVQJOH
23
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22
6TJOHQMBDFWBMVFDIBSUTUPBEEBOETVCUSBDUOVNCFSTJTBVTFGVM TLJMMGPSDIJMESFO FTQFDJBMMZXIFOEFBMJOHXJUIHSFBUFSOVNCFST %PJOHBDUJWJUJFTMJLFUIFGPMMPXJOHXJUIZPVSDIJMEXJMMIFMQIJNPS her master this skill. % 6TFUIFnBTIDBSETPGOVNCFSTUPGSPN$IBQUFSPS write the numbers 0 to 9 on index cards.
Tens Ones
Tens Ones
1
3
1
8
+ 1
8
– 1
3
% &ODPVSBHFZPVSDIJMEUPVTFQMBDFWBMVFDIBSUTUPBEE or subtract.
26
23
24
25
26
22 + 3 = 25 Count onGSPNUIFHSFBUFS OVNCFSUPmOEUIFBOTXFS
A place-value chart shows how many tens and ones there are in a number. Tens
Ones
2
3
:PVregroup when you DIBOHFPOFTUPUFOPS 1 ten to 10 ones.
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School-to-Home Connections
1BSchToHome_NEW.indd 29
27
Count backGSPNUIFHSFBUFS OVNCFSUPmOEUIFBOTXFS
Adding and Subtracting
% )BWFZPVSDIJMEQJDLBOZDBSETBOEGPSNUXPEJHJU OVNCFST&OTVSFUIFOVNCFSTEPOPUBEEVQUPNPSF than 40.
25
27 – 4 = 23
% TPMWJOHSFBMXPSMEQSPCMFNT
Activity
24
29 3/26/09 5:04:07 PM
Conexiones entre
ESCUELA 13
Operaciones de suma y resta hasta 40
Estimada familia:
Vocabulario para practicar
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Actividad
t1JEBBTVIJKPRVFFMJKBDVBUSPUBSKFUBTZGPSNFOÞNFSPTEF EPTEÓHJUPT"TFHÞSFTFEFRVFMPTOÞNFSPTOPTVNFONÈT de 40. %FDFOBT 6OJEBEFT
%FDFOBT 6OJEBEFT
1
3
1
8
+ 1
8
– 1
3
t&TUJNVMFBTVIJKPQBSBRVFVUJMJDFUBCMBTEFWBMPS posicional para sumar o restar. t1JEBBTVIJKPRVFTVNFMPTEPTOÞNFSPT t"DPOUJOVBDJØO QJEBBTVIJKPRVFJEFOUJmRVFFMOÞNFSP NFOPSZMPSFTUFEFMOÞNFSPNBZPS
1BSchToHome_NEW.indd 30
24
25
26
27
27 – 4 = 23 Cuenta hacia atrás desde el OÞNFSPNBZPSQBSBFODPOUSBS la respuesta.
Suma y resta
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30
23
22
23
24
25
26
22 + 3 = 25 Cuenta hacia adelante EFTEFFMOÞNFSPNBZPSQBSB encontrar la respuesta. 6OBtabla de valor posicional SFQSFTFOUBDVÈOUBTEFDFOBTZ VOJEBEFTIBZFOVOOÞNFSP %FDFOBT
6OJEBEFT
2
3
Reagrupas cuando cambias 10 unidades a 1 decena o 1 decena a 10 unidades.
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Capítulo
CASA
y
Math in Focus Grade 1
3/26/09 5:04:08 PM